第三次月考之核心语法精练100题（Units 5-6）2025-2026学年八年级下学期英语 核心知识点 易错重难点考前特训（沪教版）

**基本信息** 聚焦形式主语it、enough用法及情态动词should/had better三大核心语法点，通过分层题型构建从基础辨析到语境应用的递进训练体系，提升语言运用能力与思维品质。 **专项设计** |模块|题量/典例|题型特征|知识逻辑| |----|-----------|----------|----------| |单项选择|50题|考查语法点基础辨析（如enough位置、had better否定式）|以语法规则为核心，覆盖三大知识点的基础用法与易混点| |单句语法填空|30题|直接考查语法点应用（如should肯定否定、形式主语结构）|衔接基础规则与语境运用，强化语法形式准确性| |完成句子填空|20题|结合语境翻译（如形式主语句型、enough搭配）|实现语法知识向语言表达的迁移，提升综合运用能力|

考前特训 八年级下册第三次月考之核心语法综合练习（新教材沪教版） (形式主语 it 和 enough+ 情态动词 should 和 had better) 内容提要 单项选择题 单句语法填空题 完成句子填空题 班级 姓名 学号 分数 （时间：60分钟，满分：120分） 一、单项选择(本大题共50小题，每小题1分，共50分) 1．---Are you _______ to do your favorite things? ---Yes. I have enough time _______ them. A．free enough; to do B．enough free; doing C．free enough; doing D．enough free; to do 【答案】A 【详解】试题分析：句意：你有足够的空来做你最喜欢的事情吗？——是的，我有足够的时间来做它们。enough修饰形容词,放在所修饰的形容词之后，排除A,C；have time to do sth.有做某事的时间。故答案为A。 考点：考查动词不定式。 2．You had better ________ your homework quickly, or we will be late for the movie The Battle at Lake Changjin. A．finish B．to finish C．finishing D．finished 【答案】A 【详解】句意：你最好快点完成作业，否则我们看电影《长津湖》就要迟到了。 考查情态动词的用法。had better是情态动词，后接动词原形。had better do sth.“最好做某事”。故选A。 3． You’d better here the heavy rain. —Yes, That’s the traffic rule. A．not to leave; because of B．not leave; because of C．not to leave; because D．not leave; because 【答案】B 【详解】试题分析：句意：因为下着大雨，你最好不要离开这。是的，这是交通规则。had better(not) do最好（不要）干某事，because后面加句子，because of后加名词词组。结合句意，故选B 考点：考查动词短语。 4．I think ______ is necessary ______ us to do something useful to protect the birds. A．this; for B．it; of C．this; of D．it; for 【答案】D 【详解】考查固定句型。It is+adj. for sb. to do sth.“做某事对某人来说怎么样。”当形容词指人时，用介词of；指物时，用介词for。think it+adj.“认为......”，其中的it是形式宾语，形容词是宾补。故选D。 5．After having a three-day rest, my father is now feeling _____ to go to work. A．enough good B．enough well C．well enough D．good enough 【答案】C 【详解】句意:在休息了三天之后，我的父亲现在感觉很好，可以去上班了。 考查形容词和副词。enough足够，是一个副词，它修饰形容词或其他副词的时候，应该放在它们的后面。well形容词，表示身体好，故选C。 6．Tom is ________ to take care of his little sister. He is only 6 years old. A．too old B．young enough C．too young D．old enough 【答案】C 【详解】句意：汤姆太小了，不能照顾他的小妹妹。他只有6岁。 考查形容词短语辨析。too old太大；young enough足够小；too young太小；old enough足够大。根据“He is only 6 years old.”可知，汤姆只有6岁，所以应该是“太小”而不能照顾他的小妹妹，too...to...表示“太……而不能”。故选C。 7．We ________ be more careful, or we will lose the chance again. A．can B．might C．may D．should 【答案】D 【详解】句意：我们应该更加小心，否则我们会再次失去机会。 考查情态动词。can能，会；might可能；may可以；should应该。根据“or we will lose the chance again.”可知，此处是应该更小心。故选D。 8．I think ________ is important for us to eat healthily and exercise often. A．that B．one C．it D．this 【答案】C 【详解】句意：我认为对我们来说健康饮食和经常锻炼非常重要。 考查it做形式主语。根据句中“is important for us to eat healthily and exercise often”可知，该句型是“It + is + adj. + for sb. +to do sth.”对于某人来说做某事怎么样。“it”在句中做形式主语。故选C。 9．You ________ leave the tap running when you brush your teeth. It’s a waste of water. A．needn’t B．mustn’t C．can’t D．shouldn’t 【答案】D 【详解】句意：刷牙时你不应该让水龙头一直流着。那是浪费水。 needn’t 不必；mustn’t禁止；can’t不能；shouldn’t不应该。根据“It’s a waste of water.”可知，让水龙头一直流着是浪费水的行为，是不正确的，此处表示劝告或建议，应用shouldn’t。 10．—I’m to eat a horse now! —Really? But I don’t have for you. It’s a great pity! A．enough hungry; food enough B．enough hungry; enough food C．hungry enough; food enough D．hungry enough; enough food 【答案】D 【详解】试题分析：句意：—我现在饿极了能吃一头牛！— 真的吗？可是我没有足够的食物给你。真是很可惜 ！enough做形容词修饰名词可前可后，但是通常放在名词前，强调enough（足够的）;做副词修饰形容词或副词，要放在形容词或副词的后面，根据语境可知强调没有足够的，所以选D。 考点: 考查enough的用法。 11．You have made some mistakes again. I think you ________ be more careful next time. A．should B．can C．may D．would 【答案】A 【详解】句意：你又犯了一些错误。我觉得你下次应该仔细点。 考查情态动词辨析。should应该；can可以，能；may可以，也许；would将会。根据“I think you ... be more careful next time.”可知，此处指你下次应该仔细点。故选A。 12．The dining hall isn't ________ for 200 people to sit ________. A．enough big; 不填 B．big enough; 不填 C．large enough; in D．enough large; by 【答案】C 【详解】句意：餐厅不够大，坐不下200人。 考查形容词+enough及介词。in在……里面；by旁边；形容词+enough，所以排除A、D；根据sit表示“坐”，是不及物动词，可推测出此处是缺介词“in”，故选C。 13．What a lifelike（逼真的）cat! I _____________ believe you made it out of paper. A．needn’t B．mustn’t C．can’t D．shouldn’t 【答案】C 【详解】句意：多么逼真的一只猫啊！我不相信你用纸做的。 考查情态动词词义辨析。needn’t无需，不必；mustn’t禁止；can’t不能；shouldn’t不应该。根据情态动词词义和语境可知，是表达“不能”相信它是纸做的。故选C。 14．In order to save more space on the phone, we ________ set up the apps that are not often used. A．can B．can’t C．should D．shouldn’t 【答案】D 【详解】句意：为了节省手机上更多的空间，我们不应该安装不经常用的软件。 考查情态动词的用法。can能够，可以，表示能力或许可；can’t不能；should应该，表示建议或责任；shouldn’t不应该。根据前半句“In order to save more space on the phone”可知为了节省空间，是不应该安装不常用的软件，应用“shouldn’t”。故选D。 15．I think that your son had better ________ too many computer games. A．not to play B．not playing C．not play D．not to playing 【答案】C 【详解】句意：我认为你的儿子最好不要玩太多的电脑游戏。 考查情态动词的用法。分析题干，该句考查“had better not do sth. 最好不要做某事”，表示劝告或建议，为固定搭配。故选C。 16．To keep us safe, we ________ play with knives or scissors. A．must B．should C．shouldn’t D．needn’t 【答案】C 【详解】句意：为了保持我们的安全，我们不应该玩刀或剪刀。 考查情态动词辨析。must必须，表示义务或责任；should应该，表示建议或责任；shouldn’t不应该，表示否定建议或责任；needn’t不需要，表示没有必要。根据句意“为了保持我们的安全”可知，此处是在给出建议，且是建议不要玩危险物品，因此使用shouldn’t符合语境。其他选项均不符合句意。故选C。 17．Yes, Jasmine. First, you ________ always focus on what the teacher says in class. Take notes when you need to. A．may B．may not C．should D．shouldn’t 【答案】C 【详解】句意：是的，贾斯敏。首先，你应该总是专注于老师在课堂上说的话。需要的时候做笔记。 考查情态动词辨析。may可以；may not不可以；should应该；shouldn’t不应该。根据“you...always focus on what the teacher says in class. Take notes when you need to.”可知，应该专注于老师在课堂上说的内容，需要的时候做笔记，所以此处表示建议，应用should。故选C。 18． Is this room ________ the meeting? A．large enough to have B．enough large to have C．large enough having D．enough large having 【答案】A 【详解】句意：这个房间足够大来开会么？ 考查定语后置。enough修饰形容词放在后面，足以做某事用enough to do，故选A。 19．You’d better __________ the piano now. Your father is sleeping. A．not to play B．not play C．don’t play D．not playing 【答案】B 【详解】句意：你的父亲正在睡觉。你最好现在不要弹钢琴。 考查非谓语动词。表达“最好做某事”用“had better do”的结构，表达否定，在动词原形前加否定词“not”。表达“不要弹钢琴”用“not play”。故选B。 20．Don’t worry. She is ________ to babysit her little sister. A．enough carefully B．enough careful C．carefully enough D．careful enough 【答案】D 【详解】句意：不要担心。她足够细心能照顾她的小妹妹。 考查形容词和副词。enough足够，放在形容词和副词的后面。careful细心的；carefully细心地。根据“She is”可知填形容词作表语，用“careful”。 “enough”放在形容词后面，表示“足够细心”用“careful enough”。故选D。 21．It’s necessary for you ________ the classroom clean. A．keep B．keeping C．to keep D．kept 【答案】C 【详解】句意：你需要保持教室清洁。 考查非谓语动词。根据题干可知此处是结构“It is adj. for sb to do sth”，意为“做某事对某人来说是……的”，动词不定式作主语。故选C。 22．It is going to rain. You’d better ________ an umbrella with you. A．take B．to take C．taken D．taking 【答案】A 【详解】句意：要下雨了。 你最好带把伞。 考查had better的用法。had better do sth“最好做某事”，故选A 23．The house is not for us to live in. A．small enough B．enough small C．big enough D．enough big 【答案】C 【详解】试题分析：句意：这座房子我们住进去不是足够的大。enough修饰形容词的时候应该放在形容词的后面，故排除BD；根据句意故选C。 考点：考查enough的用法。 24．It is easy for the students to school because of the new subway in the city. A．to go B．go C．goes D．going 【答案】A 【详解】句意：因为城市中的新地铁，对学生们来说去学校很容易。 考查非谓语动词。it is adj. for sb. to do sth.“做某事对某人来说是……的”，it作形式主语，动词不定式作真正的主语。故选A。 25．一 “Go to the playground and have fun!” parents often say to their kids. 一 But they _______ remember playgrounds can be dangerous. A．may B．will C．need D．should 【答案】D 【详解】句意：—— “去操场，玩得开心！”父母经常这样对他们的孩子说。—— 但他们应该记得操场是危险的。 考查情态动词。may可能；will将要；need需要；should应该。结合句意可知，孩子应该记住，操场也可能危险。故选D。 26．You’d better _________ your work without reading the instructions. A．not to begin B．not begin C．don’t begin D．to not begin 【答案】B 【详解】句意：你最好不要在没有阅读说明书的情况下开始工作。 考查情态动词。情态动词had better后面要加动词原形，否定句式为you’d better not do sth“你最好不要做某事”，固定搭配。故选B。 27．We all know that we’ll meet all kinds of difficulties in our lives in the future. We should learn to be ________ any challenge! A．confident enough to take on B．active enough to take up C．enough careful to take try on D．enough patient to try out 【答案】A 【详解】句意：我们都知道，在我们的生活中将来会遇到各种困难。我们应该学会有足够的自信去迎接任何挑战。 考查enough的用法及动词短语辨析及形容词辨析。enough修饰形容词放在形容词的后面，排除C/D选项；take on接纳，承担；take up开始从事……；try on 试穿；try out试验；confident有信心的；active积极的；careful仔细的；patient耐心的；此处指的是要有足够的信心接受任何挑战，故选A。 28．— How do you find the lecture of Li Yang Crazy English? — I think it’s ______, but someone thinks it’s much too ______. A．wonderful enough; bored B．enough wonderful; boring C．wonderful enough; boring D．enough wonderful; bored 【答案】C 【详解】句意：你觉得李阳的疯狂英语课程怎么样？——我认为它好极了，但是有人认为她很令人厌烦。wonderful奇妙的，极好的；enough足够的；bored无聊的；boring令人感到厌烦的。Enough修饰形容词或副词时，位于形容词或副词的后面。boring修饰事物，bored描述人的感受，此处修饰演讲，故用boring。故选C。 29．—What do you think of the film “The Battle at Lake Changjin”? —I think it’s ________, but someone thinks it’s ________. A．wonderful enough; boring B．enough wonderful; boring C．wonderful enough; bored D．enough wonderful; bored 【答案】A 【详解】句意：——你觉得电影《长津湖》怎么样？——我觉得这已经足够精彩了，但有人觉得这很无聊。 考查enough的用法以及形容词辨析。boring令人无聊的，形容物；bored感到无聊的，形容人。enough“足够的”，修饰形容词时放形容词之后，排除BD；空格二处指代这部电影，用形容词boring。故选A。 30． Luckily, more and more people in China are __________ to keep their_______ down in public. A．polite enough; voice B．enough polite; voice C．too polite; sound D．too polite; noise 【答案】A 【详解】句意：幸运地是，越来越多的中国人在公共场所保持低声说话是足够礼貌的。 考查固定短语及enough的用法。enough作为副词时，放在修饰词的后面；keep one’s voice down低声说话，是固定短语。故选 A。 31．A country has dreams. We teenagers________ also have dreams. With dreams and hard work, anything amazing can be treated. A．should B．must C．may D．can 【答案】A 【详解】句意“一个国家有梦想，我们青少年也应该有梦想，伴随着梦想和努力工作，任何惊奇的事都会被创造”。A.应该；B.必须；C.可能；D.能。根据句意可知，表示“青少年应该有梦想”。表示责任和义务，用should，故选A。 32．--Suzy,I can’t see the words on the blackboard clearly.What’s wrong? --Your eyesight is getting worse.You had better too much time on games. A．not to spend B．not spend C．don’t spend D．not spending 【答案】B 【详解】句意：你最后不要花费太多时间在游戏上。考查had better的用法。had better最好，相当于情态动词的用法，后加动词原型，否定形式为had better not do sth最好不要做……，故选B 33．If we go out, we ________ wear masks to stop the spread （扩散）of COVID-19. A．should B．would C．can’t D．mustn’t 【答案】A 【详解】句意：如果我们外出，我们应该戴口罩，以阻止COVID-19的传播。 考查情态动词。should应该；would将(will的过去式)；can’t不能；mustn’t禁止。根据句中“to stop the spread of COVID-19”可知是应该戴口罩。故选A。 34．He is ________ to carry ________ for the old man. A．strong enough; enough mango B．enough strong; enough mangoes C．strong enough; enough mangoes D．enough strong; mango enough 【答案】C 【详解】句意：他很强壮，可以为这位老人带足够的芒果。 考查形容词和副词辨析。enough足够的，作形容词，修饰名词，放在所修饰词的前面；也可以作副词，修饰形容词时，放在形容词的后面。因此第一个空表示“足够强壮”，应用strong enough；第二个空表示“足够的芒果”，应该是enough mangoes。故选C。 35．________ is important for ________ to have breakfast every day A．This; him B．It; he C．It; him D．That; him 【答案】C 【详解】句意：对他来说，每天吃早餐很重要。 考查形式主语和人称代词的用法。该句主要涉及到“It is adj. for sb to do sth”这个结构，表示“做某件事对某人来说怎么样”，第一空需要填it，作形式主语，指代后面的不定式结构；第二空需要使用宾格代词him作介词for的宾语。故选C。 36．These shoes aren’t comfortable. You __________ wear them. A．should B．could C．shouldn’t D．can 【答案】C 【详解】试题分析：should应该；could能，可能；shouldn’t不应该； can能，可能。句意：这双鞋不舒服，你不应该穿他们。结合语境可知选C。 考点：情态动词辨析 点评：情态动词的考查是初中英语考查的重点，平时学习中一定要熟记这些词的基本词义及用法上的不同，注意其用法及在句子中表达语气的不同。考试中结合语境选择合适答案。 37．After having a three-day rest, my mother now is feeling ________ to go to work. A．too good B．too well C．good enough D．well enough 【答案】D 【详解】句意：在三天的休息之后，我的妈妈现在感觉足够好了可以去工作。 考查形容词词义辨析。good 形容词，好的；well 形容词，身体好的。根据“After having a three-day rest”可知，应该是身体好，故排除A和C。too...to表示“太……而不能”；形容词enough to do表示“足够的……能”。身体好了，应该能上班。故选D。 38． In my opinion, he doesn’t seem __________ to take this job. A．wisely enough B．enough wisely C．wise enough D．enough wise 【答案】C 【详解】句意为：依我看，他从事这项工作似乎不够明智。 考查enough的用法。seem是连系动词，后应接形容词，故排除A、B；enough修饰名词置于名词之前，修饰形容词或副词置于形容词或副词之后；故选C。 39．I didn’t have , so I didn’t prepare it . A．time enough; enough good B．enough time; enough well C．time enough; enough well D．enough time; well enough 【答案】D 【详解】句意：我没有足够的时间，所以我没有准备好它。enough足够的，修饰名词时，位于名词的前面，修饰形容词或副词时，位于形容词或副词的后面。第二空修饰动宾短语prepare it，用副词well，故选D。 40．Ruby can tell stories, but ________ is not easy for her to write a story. A．one B．that C．this D．it 【答案】D 【详解】句意：Ruby擅长讲故事，但对她来说写故事并不容易。 考查代词辨析。one一个；that那个；this这个；it它。本句是固定句型：It is+形容词+for sb. to do sth.“对某人来说干某事怎么样”，其中it是形式主语，真正的主语是后面的动词不定式。故选D。 41．—Teenagers _______ allowed to drive a car. — That’s true. It’s too dangerous for them to drive a car. A．should be not B．should not be C．should be D．should not 【答案】B 【详解】试题分析： 考查情态动词。句意 青少年不应该被允许开车。这是真的，对于他们来说，开车太危险了。Should表应该，be allowed to do ,被允许做某事，故选B项。 考点：考查情态动词。 42．— How long does ________ usually take you to do your homework? — About half an hour. A．this B．it C．that D．he 【答案】B 【详解】句意：——你通常花多长时间做作业？——大约半个小时。 考查代词。this这；it它；that那；he他。根据问句“How long does…usually take you to do your homework”可知此处应是take表“花费”的用法，此时主语要用it作形式主语。故选B。 43．Jack his pet dog every day. The dog must feel sad when he’s alone all day long. A．should walking B．should to walk C．had better walk D．had better to walk 【答案】C 【详解】试题分析：句意：杰克最好每天都要遛遛他的宠物狗。那条狗一整天都单独呆着一定感到难过。had better do sth意为“最好做某事”；should do sth意为“应该做某事”；故选C。 考点：考查情态动词。 44．________ more accidents, you’d better ________ the driving speed. A．Stopped; to slow down B．Stop; to slow down C．To stop; slow down D．Stopping; slow down 【答案】C 【详解】句意：为了防止更多的事故发生，你最好放慢车速。 考查动词不定式和情态动词的用法。Stopped过去式/过去分词；Stop动词原形；To stop动词不定式；Stopping动名词/现在分词；slow down降低，放慢，动词短语。分析第一空可知，此处表目的，所以用其动词不定式形式；had better是情态动词，后接动词原形，had better do sth.“最好做某事”。故选C。 45．Health is important to everyone, so we ________ take it seriously. A．can’t B．might C．mustn’t D．should 【答案】D 【详解】句意：健康对每个人都很重要，所以我们必须认真对待。 考查动词辨析。can’t不能；might可能；mustn’t禁止；should应该。由句中“Health important everyone”可知，需要用should表示“应该”认真对待，故选D。 46． You leave your kid alone at home. It’s very dangerous. A．wouldn’t B．needn’t C．couldn’t D．shouldn’t 【答案】D 【详解】试题分析：句意：你不应该把你的孩子单独留在家，太危险了。考查情态动词的用法。wouldn’t意为“将不，不会”；shouldn’t意为“不应该” couldn’t意为“不能；needn’t 不必”。结合句意，故选D 考点：考查情态动词的用法。 47．—________ is our duty to learn and pass down our Chinese culture. —Yeah, I think so, too. A．This B．That C．It D．One 【答案】C 【详解】句意：——学习和传承中华文化是我们的责任。——是的，我也这么认为。 考查代词辨析。This这；That那；It它；One一个。根据“...is our duty to learn and pass down our Chinese culture.”可知，空处应是it，作形式主语，it is one’s duty to do sth.“做某事是某人的责任”。故选C。 48．The house has ________ and each room is ________. A．enough rooms; enough big B．enough rooms; big enough C．rooms enough; big enough D．rooms enough; enough big 【答案】B 【详解】句意：这所房子有足够的房间，每个房间都足够大。 考查enough的用法。enough作形容词修饰名词时要放在名词前面，排除C、D选项；enough作副词修饰形容词时放在形容词后面，排除A选项。故选B。 49．It is rude ________ you to speak to the old man in this way, so it is important ________ us to master social skills. A．to; for B．of; for C．for; for D．of; of 【答案】B 【详解】句意：你用这种方式和老人说话很不礼貌，所以掌握社交技能对我们来说很重要。 考查It固定句型。考查It is +adj+of/for sb to do sth固定句型，for sb常用于表示事物的特征特点，of sb一般表示人物的性格、品德。第一空根据“rude”可知，形容词人的性格，故填of；第二空根据 “important”可知，表示事物的特征特点，故填for。故选B。 50．I find _______ faster to take a plane there, so I am considering _______ there . A．it , to fly B．that, flying C．it’s, flying D．it’s, to fly 【答案】C 【详解】试题分析：句意：我发现坐飞机去那里更快，所以我考虑飞往那里。It is + 形容词 + to do sth是一个固定句型，其中的it是形式主语，真实主语是后面的动词不定式短语。consider doing sth考虑做某事。所以选C。 考点：考查代词及非谓语动词。 二、单句语法填空：在空格处填入一个适当的词或用所给单词的适当形式填空(本大题共30小题，每小题1分，共30分) 51．You ________ (should) eat more vegetables. 【答案】should 【详解】句意：你应该多吃蔬菜。根据句子结构，这里需要一个情态动词来修饰动词“eat”，表示一种建议或义务。should“应该”，是情态动词，直接跟动词原形。故填should。 52．She said we had better ________ (practise) more often and improve teamwork. 【答案】practise 【详解】句意：她说我们最好更频繁地练习，提升团队协作能力。practise“练习”，动词；“had better do sth”表示“最好做某事”，此处填动词原形。故填practise。 53．It’s important for children ________ (develop) good habits. 【答案】to develop 【详解】句意：对孩子来说养成好习惯是重要的。It is+adj for sb to do sth.表示“对某人来说做某事是……”，故填to develop。 54．It’s important ________ (protect) our personal information. 【答案】to protect 【详解】句意：保护我们的个人信息是很重要的。本句为固定句型：It’s+形容词+to do sth.，真正的主语是后面的动词不定式to do，因此protect需变为to protect。 55．You ________ be careful when you cross the road. 【答案】should/must 【详解】句意：过马路时你应该/必须小心。根据“You... be careful when you cross the road.”可知，此处可填should“应该”，表示建议“过马路时需小心”；也可填must“必须”，表示“过马路时你必须要小心”，语气更强烈。故填should/must。 56．You had better _________ (not speak) carelessly in class. It’s not polite. 【答案】not speak 【详解】句意：你最好不要在课堂上粗心大意地说话。很不礼貌。had better not do sth表示“最好不要做某事”。故填not speak。 57．It’s important ________ (keep) warm in winter. 【答案】to keep 【详解】句意：在冬天保持温暖是重要的。keep意为“保持”，是动词，句子是固定句型“It’s+形容词+to do sth.”，意为“做某事是……的”，其中it是形式主语，不定式是真正主语。此处用keep的不定式to keep。 58．I’m active and it’s ________ for me to stay at home all day at weekends.（usual） 【答案】unusual 【详解】句意：我很活跃，周末整天待在家里对我来说很不寻常。根据“it’s...for me to stay at home all day at weekends.”可知，此处是固定词组，It’s+形容词+for sb to do sth“对某人来说做某事是怎样的”，这里意为“周末整天待在家里对我来说很不寻常”，因此这里填usual的反义词unusual“不寻常的”作表语。故填unusual。 59．It’s hard work, it’s _________ (possible) for him to finish it in such a short time. 【答案】impossible 【详解】句意：这项工作很难，对他来说，在如此短的时间完成是不可能的。表达“做某事对某人来说是……的”用“it’s形容词for sb. to do”的结构。“it”是形式主语，动词不定式“to finish”是真正的主语。根据“hard work”可知表达“在如此短的时间完成是不可能的”，用“possible”的反义词“impossible”。故填impossible。 60．It’s important for us ________ ( remember ) our family’s telephone numbers. 【答案】to remember 【详解】句意：记住家人的电话号码对我们来说很重要。It’s+adj.+for sb.+to do sth.为固定句型，动词不定式是真正的主语，所以这里应该用to remember。 61．It takes Ann twenty minutes ________ (go) there. 【答案】to go 【详解】句意：Ann花费20分钟到那里。go “去” ，是动词，分析可知句子结构为it takes sb. some time to do sth. “做某事花费某人多长时间” ，动词不定式作主语，故填to go。 62．It takes me about two hours _________ (do) some shopping. 【答案】to do 【详解】句意：购物花了我大约两个小时。该题考查固定句型“it takes sb. some time to do sth.”, 意为“做某事花费了某人多长时间”，其中it为形式主语，不定式to do sth.为真正的主语。句子所给词为do，空格处应填do的不定式形式。故填to do。 63．To make your DIY perfect, you’d better ________ (not start) before you get all the tools ready. 【答案】not start 【详解】句意：为了使你的DIY完美，你最好在准备好所有工具之前不要开始。根据固定搭配had better not do sth“最好不要做某事”可知，应该是你最好在准备好所有工具之前不要开始，start意为“开始”，故填not start。 64．You’d better ________ (not cut) your names on the bamboo here. 【答案】not cut 【详解】句意：你们最好不要把你们的名字刻在这里的竹子上。根据短语“had better not do sth.（最好不要做某事）”可知，此空应填not cut。故填not cut。 65．You ________ (should) spend too much on snacks. 【答案】shouldn’t 【详解】句意：你不应该在零食上花费太多。根据语境可知此处表否定建议，should的否定形式为shouldn’t。故填shouldn’t。 66．—Alice wants to be an actress. —Oh, she ________ take acting classes. 【答案】should 【详解】句意：——爱丽丝想成为一个女演员。——噢，她应该去上表演课。根据对话语境，爱丽丝想成为女演员，对方给出建议“她应该上表演课”。表示建议用情态动词should。 67．_________ is very common to be afraid of snakes. 【答案】It 【详解】句意：害怕蛇是很常见的。根据“...is very common to be afraid of snakes.”可知，此处是“It is+adj+to do sth”句型，使用it作形式主语，故填It。 68．You’d better ________ (go) and watch the football match in the sports hall. 【答案】go 【详解】句意：你最好去体育馆观看足球比赛。此处是短语had better do sth“最好做某事”，空处使用动词原形。故填go。 69．It’s __________ (polite) to shout at the old people. 【答案】impolite 【详解】句意：对老人大喊是不礼貌的。根据后面的“shout at the old people”可知，应该是对老人大喊是不礼貌的，由“it’s”可知，应该填形容词作表语，impolite意为“不礼貌的”，故填impolite。 70．Is it important for us students________ (learn) English well? 【答案】to learn 【详解】句意：对我们学生来说学好英语很重要吗? It + be + adj. for sb. to do sth.是固定句型，意思是“对某人来说做某事……”，不定式做真正宾语；根据句意语境和英文提示，可知填to learn。 71．It is important for us ________ (learn) how to protect ourselves. 【答案】to learn 【详解】句意：对我们来说，学习如何保护自己是重要的。it is adj. to do sth. “做某事是……”，“it”是形式主语，动词不定式是真正的主语。故填to learn。 72．It’s too hot in the room. You’d better __________ (not close) the windows. 【答案】not close 【详解】句意：房间里太热了。你最好不要关窗户。根据“It’s too hot in the room.”可知，此处表示你最好不要关窗户。You’d是You had的缩写，短语had better not do sth.意为“最好不要做某事”，结合提示词可知，空格处应填not close，其中close是动词，意为“关闭”。故填not close。 73．It’s ________ (fair) to call 2019-nCov Chinese coronavirus(冠状病毒). 【答案】unfair 【详解】句意：把2019新型冠状病毒叫中国冠状病毒是不公平的。根据句型“It’s+adj.+to do sth.”意为“做某事是……”可知，空格处应填形容词，又根据客观事实可知这里指是不公平的；fair公平的，是形容词，对应的反义词是unfair不公平的，故填unfair。 74．It is very nice ________ (eat) ice cream on hot days in summer. 【答案】to eat 【详解】句意：在夏天的大热天吃冰激凌是很好的。分析句子可知，该句为固定句型“It is +adj.+to do sth.做某事是怎样的”，to do 作真正的主语。故填to eat。 75．It is important for us _______ (protect) the Earth. 【答案】to protect 【详解】句意：保护地球对我们来说很重要。此处是固定句型“It is+adj+for sb to do sth”，空处用不定式形式作主语，it是形式主语，故填to protect。 76．You had better __________ (not drink) wine because you have to drive back home. 【答案】not drink 【详解】句意：你最好不要喝酒因为你必须开车回家。根据“had better”可知，此处考查短语had better do sth.“最好做某事”，空处用动词原形，否定形式在动词原形前加not。故填not drink。 77．The novel itself is meaningless, so it’s a waste of time ________ (read) it several times. 【答案】reading/to read 【详解】句意：小说本身是无意义的，所以读它几次就是在浪费时间。分析句子可知it为形式主语，此处动词做真正的主语，所以应用其动词不定式或动名词形式，故填reading/to read。 78．It worried her a bit ________ her hair was turning grey. 【答案】that 【详解】句意：她的头发正在变白使她很焦虑。分析句子结构可知，it在句子中充当形式主语以及后面的“her hair was turning grey”可知，真正的主语应该是that引导的主语从句，故填that。 79．—In many places, there is not much water. So we should reuse and save it. —That’s right. We should not ________ it. 【答案】waste 【详解】句意：——在许多地方，水不多。所以我们应该重复利用并保护水资源。——对的。我们不应该浪费它。根据“So we should reuse and save it.”可知，我们要反复利用，不能浪费。“浪费”对应英文单词waste；情态动词should后要用动词原形，即waste。故填waste。 80．It’s a great idea ________ (plant) a tree for your birthday! And It’s fun ________ (watch) it grow. 【答案】 to plant to watch 【详解】句意：为你的生日种树是一个好主意。而且看着它长大很有趣。第一空，plant是一个实义动词，意为“种植”，“plant a tree”可用来表示“种树”；因为第一个句子主语是it，是形式主语，需要用不定式“to plant”作真正的主语放在后面。第二空，watch是一个实义动词，表示“看”，此句主语it也是形式主语，需要用不定式“to watch”作真正的主语。故填to plant；to watch。 三、完成句子：根据汉语提示完成下列句子(本大题共20小题，每小题2分，共40分) 81．阅读之前先浏览一下问题,这是很重要的。 It is important to ________ ________the questions first before ________. 【答案】 look through reading 【详解】结合中文句意提示可知，look through浏览；read阅读；通过分析已给英文句子结构可知，此处“it”作形式主语，真正的主语为后面的动词不定式，不定式符号“to”后接动词原形，介词before后接动名词。故填look；through；reading。 82．到我们的小组课题时间了。 ________ ________ ________ our group project. 【答案】 It’s time for 【详解】对照中英文可知，缺乏的中文部分是“到……时间了”，其英文表达是“It’s time for sth.”，为固定结构，位于句首，首字母大写。故填It’s；time；for。 83．对我们来说学习如何帮助他人很重要。 ________ ________ ________ for us to learn how to help others. 【答案】 It is important 【详解】根据中英文对照可知，此处缺少“……很重要”。“It is + 形容词 + for sb. to do sth.”是固定句型，其中“it”作形式主语，“is”是系动词，“important”是形容词作表语，句首字母需大写。故填It；is；important。 84．中国很强大能帮助有需要的国家。 China is ________________ to ________________ to countries in need. 【答案】 strong enough give a helping hand 【详解】对比所给中英文可知，设空处为“很强大”及“帮助”；strong enough“很强大”，固定词组；give a helping hand“帮助”，固定词组，根据空前的“to”可知，此处应用动词原形。故填strong enough；give a helping hand。 85．你最好现在去找他。 You ________ ________ ________ and look for him now. 【答案】 had better go 【详解】最好：had better，情态动词，后加动词原形；去：go，动词。故填had；better；go。 86．在冬天堆雪人是很有趣的。 ________ ________ to ________________ in winter. 【答案】 It’s interesting/fun make snowmen 【详解】对比所给中英文可知，设空处为“堆雪人是很有趣的”，结合句子结构可知，此处为“It’s+adj.+to do sth.”句式，表示“做某事是……的”，interesting/fun“有趣的”；make snowmen“堆雪人”。故填It’s；interesting/fun；make snowmen。 87．你最好不要熬夜，熬夜有害健康。 You _____________________ stay up late. It’s harmful to your health. 【答案】had better not 【详解】对比中英文可知，空处缺少“最好不要”的翻译，英文表达为had better not，后接动词原形，故填had better not。 88．在冬天，堆雪人是很有趣的。 ________ ________ ________ ________ make snowmen in winter. 【答案】 It is interesting to 【详解】interesting有趣的；分析句子结构，本句适用固定句型“It is +形容词+不定式+其他”，表示“做某事是……的”，句中it是形式主语，后面的不定式是真正主语。结合句意结构，故填It；is；interesting；to。 89．我们应该尊重彼此的差异。 We _______ respect _______ _______ _______. 【答案】 should each other’s differences 【详解】根据句意可知，此处表达“应该”用情态动词“should”；“彼此”用“each other”；“彼此的”用名词所有格“each other’s”；“差异”用复数名词“differences”，表示泛指。故填should；each；other’s；differences。 90．你最好问一下旅游公司你所有包的总重量。 ________ the travel company about the total weight for all your bags. 【答案】You’d better ask 【详解】you“你”，had better do sth“最好做某事”，ask“问”，故填You’d better ask。 91．青少年为零花钱做一个预算是明智的。 It’s ________ of teenagers ________ ________ ________ ________ for their pocket money. 【答案】 wise to make a budget​ 【详解】原句中“明智的”以及“做一个预算”是关键词，表示“明智的”形容词为“wise”；表示“做一个预算”的短语为“make a budget”。“It’s + 形容词 + of sb. + to do sth.”表示“某人做某事是……的”，“of sb.”后接动词不定式结构。故填wise；to；make；a；budget。 92．你最好锻炼而不是整天看电视。 You had better _____ __________ watching TV all day. 【答案】 take exercise instead of 【详解】根据语境，句中缺少“锻炼”和“而不是”的翻译。take exercise表示“锻炼”，前面的“had better”表示“最好”，后加动词原形；instead of表示“而不是”，是介词词组，后面加动名词。故填take exercise；instead of。 93．她又犯了一个这样的错误，真是太遗憾了。 ________ ________ ________ ________ she made such a mistake again. 【答案】 It’s a pity that 【详解】中英文对比，空处缺少“真是太遗憾了”的翻译。根据空格的数量和位置，此处用固定句式It’s a pity that…表示“真遗憾……”，故填It’s; a; pity; that。 94．当众演讲对她来说有困难。 ________________ to make a speech in public. 【答案】It is difficult for her 【详解】固定句型It is adj. for sb. to do sth.“对某人来说做某事是……的”；difficult“困难的”，是形容词；her“她”，人称代词宾格。故填It is difficult for her。 95．你不尊敬老人，这让人讨厌。 ________ ________ ________ ________ you not to respect the old. 【答案】 It is awful/annoying of 【详解】It is+形容词+of sb. to do sth.“对于某人来说做某事是……”；awful相当于annoying是形容词，意思是“讨厌的，使生气的”此处的形容词awful/annoying，在这里修饰人的品质，用介词of。故填It；is；awful/annoying；of。 96．买本字典是重要的。 It’s ______________________________a dictionary. 【答案】important to buy 【详解】根据所给汉语意思可知，应该填的是“重要的”和“买”，important意为“重要的”，buy意为“买”，根据句型it’s+形容词+to do sth“做某事是……的”可知，应该填动词不定式作真正的主语，故填important to buy。 97．选定要穿哪一条裙子去舞会是必要的。 _________ necessary _________ _________ _________ which dress to wear for the ball. 【答案】 It’s to decide on 【详解】根据句意可知，此句用“固定句型：It’s adj. to do sth.”；决定：decide on；故填It’s；to；decide；on。 98．你最好多吃蔬菜水果。 You ________ ________ have more vegetables and fruits. 【答案】 had better 【详解】根据题干可知，空处表示“最好”，had better do sth.表示“最好做某事”，had better为情态动词，无人称和数的变化。故填had；better。 99．你最好不要再上学迟到了。 You’d ______________________________ school again. 【答案】better not be late for 【详解】固定句型：had better (not) do sth“最好(不)做某事”， be late for“做某事迟到”，故填better not be late for。 100．周末去看电影是令人兴奋的。 ________ ________ ________ to go to see movies at weekends. 【答案】 It is exciting 【详解】根据所给的汉语和英语翻译可知，这里用it作形式主语，动词不定式 to go to see movies是真正的主语，这里是一般现在时，主语it为单数，因此be动词用is。“令人兴奋的”译成：exciting。故填It；is；exciting。 2 / 17乐思英语 学科网（北京）股份有限公司 $考前特训 八年级下册第三次月考之核心语法综合练习（新教材沪教版） (形式主语 it 和 enough+ 情态动词 should 和 had better) 内容提要 单项选择题 单句语法填空题 完成句子填空题 班级 姓名 学号 分数 （时间：60分钟，满分：120分） 一、单项选择(本大题共50小题，每小题1分，共50分) 1．---Are you _______ to do your favorite things? ---Yes. I have enough time _______ them. A．free enough; to do B．enough free; doing C．free enough; doing D．enough free; to do 2．You had better ________ your homework quickly, or we will be late for the movie The Battle at Lake Changjin. A．finish B．to finish C．finishing D．finished 3． You’d better here the heavy rain. —Yes, That’s the traffic rule. A．not to leave; because of B．not leave; because of C．not to leave; because D．not leave; because 4．I think ______ is necessary ______ us to do something useful to protect the birds. A．this; for B．it; of C．this; of D．it; for 5．After having a three-day rest, my father is now feeling _____ to go to work. A．enough good B．enough well C．well enough D．good enough 6．Tom is ________ to take care of his little sister. He is only 6 years old. A．too old B．young enough C．too young D．old enough 7．We ________ be more careful, or we will lose the chance again. A．can B．might C．may D．should 8．I think ________ is important for us to eat healthily and exercise often. A．that B．one C．it D．this 9．You ________ leave the tap running when you brush your teeth. It’s a waste of water. A．needn’t B．mustn’t C．can’t D．shouldn’t 10．—I’m to eat a horse now! —Really? But I don’t have for you. It’s a great pity! A．enough hungry; food enough B．enough hungry; enough food C．hungry enough; food enough D．hungry enough; enough food 11．You have made some mistakes again. I think you ________ be more careful next time. A．should B．can C．may D．would 12．The dining hall isn't ________ for 200 people to sit ________. A．enough big; 不填 B．big enough; 不填 C．large enough; in D．enough large; by 13．What a lifelike（逼真的）cat! I _____________ believe you made it out of paper. A．needn’t B．mustn’t C．can’t D．shouldn’t 14．In order to save more space on the phone, we ________ set up the apps that are not often used. A．can B．can’t C．should D．shouldn’t 15．I think that your son had better ________ too many computer games. A．not to play B．not playing C．not play D．not to playing 16．To keep us safe, we ________ play with knives or scissors. A．must B．should C．shouldn’t D．needn’t 17．Yes, Jasmine. First, you ________ always focus on what the teacher says in class. Take notes when you need to. A．may B．may not C．should D．shouldn’t 18． Is this room ________ the meeting? A．large enough to have B．enough large to have C．large enough having D．enough large having 19．You’d better __________ the piano now. Your father is sleeping. A．not to play B．not play C．don’t play D．not playing 20．Don’t worry. She is ________ to babysit her little sister. A．enough carefully B．enough careful C．carefully enough D．careful enough 21．It’s necessary for you ________ the classroom clean. A．keep B．keeping C．to keep D．kept 22．It is going to rain. You’d better ________ an umbrella with you. A．take B．to take C．taken D．taking 23．The house is not for us to live in. A．small enough B．enough small C．big enough D．enough big 24．It is easy for the students to school because of the new subway in the city. A．to go B．go C．goes D．going 25．一 “Go to the playground and have fun!” parents often say to their kids. 一 But they _______ remember playgrounds can be dangerous. A．may B．will C．need D．should 26．You’d better _________ your work without reading the instructions. A．not to begin B．not begin C．don’t begin D．to not begin 27．We all know that we’ll meet all kinds of difficulties in our lives in the future. We should learn to be ________ any challenge! A．confident enough to take on B．active enough to take up C．enough careful to take try on D．enough patient to try out 28．— How do you find the lecture of Li Yang Crazy English? — I think it’s ______, but someone thinks it’s much too ______. A．wonderful enough; bored B．enough wonderful; boring C．wonderful enough; boring D．enough wonderful; bored 29．—What do you think of the film “The Battle at Lake Changjin”? —I think it’s ________, but someone thinks it’s ________. A．wonderful enough; boring B．enough wonderful; boring C．wonderful enough; bored D．enough wonderful; bored 30． Luckily, more and more people in China are __________ to keep their_______ down in public. A．polite enough; voice B．enough polite; voice C．too polite; sound D．too polite; noise 31．A country has dreams. We teenagers________ also have dreams. With dreams and hard work, anything amazing can be treated. A．should B．must C．may D．can 32．--Suzy,I can’t see the words on the blackboard clearly.What’s wrong? --Your eyesight is getting worse.You had better too much time on games. A．not to spend B．not spend C．don’t spend D．not spending 33．If we go out, we ________ wear masks to stop the spread （扩散）of COVID-19. A．should B．would C．can’t D．mustn’t 34．He is ________ to carry ________ for the old man. A．strong enough; enough mango B．enough strong; enough mangoes C．strong enough; enough mangoes D．enough strong; mango enough 35．________ is important for ________ to have breakfast every day A．This; him B．It; he C．It; him D．That; him 36．These shoes aren’t comfortable. You __________ wear them. A．should B．could C．shouldn’t D．can 37．After having a three-day rest, my mother now is feeling ________ to go to work. A．too good B．too well C．good enough D．well enough 38． In my opinion, he doesn’t seem __________ to take this job. A．wisely enough B．enough wisely C．wise enough D．enough wise 39．I didn’t have , so I didn’t prepare it . A．time enough; enough good B．enough time; enough well C．time enough; enough well D．enough time; well enough 40．Ruby can tell stories, but ________ is not easy for her to write a story. A．one B．that C．this D．it 41．—Teenagers _______ allowed to drive a car. — That’s true. It’s too dangerous for them to drive a car. A．should be not B．should not be C．should be D．should not 42．— How long does ________ usually take you to do your homework? — About half an hour. A．this B．it C．that D．he 43．Jack his pet dog every day. The dog must feel sad when he’s alone all day long. A．should walking B．should to walk C．had better walk D．had better to walk 44．________ more accidents, you’d better ________ the driving speed. A．Stopped; to slow down B．Stop; to slow down C．To stop; slow down D．Stopping; slow down 45．Health is important to everyone, so we ________ take it seriously. A．can’t B．might C．mustn’t D．should 46． You leave your kid alone at home. It’s very dangerous. A．wouldn’t B．needn’t C．couldn’t D．shouldn’t 47．—________ is our duty to learn and pass down our Chinese culture. —Yeah, I think so, too. A．This B．That C．It D．One 48．The house has ________ and each room is ________. A．enough rooms; enough big B．enough rooms; big enough C．rooms enough; big enough D．rooms enough; enough big 49．It is rude ________ you to speak to the old man in this way, so it is important ________ us to master social skills. A．to; for B．of; for C．for; for D．of; of 50．I find _______ faster to take a plane there, so I am considering _______ there . A．it , to fly B．that, flying C．it’s, flying D．it’s, to fly 二、单句语法填空：在空格处填入一个适当的词或用所给单词的适当形式填空(本大题共30小题，每小题1分，共30分) 51．You ___________ (should) eat more vegetables. 52．She said we had better ___________ (practise) more often and improve teamwork. 53．It’s important for children ___________ (develop) good habits. 54．It’s important ___________ (protect) our personal information. 55．You ___________ be careful when you cross the road. 56．You had better ____________ (not speak) carelessly in class. It’s not polite. 57．It’s important ___________ (keep) warm in winter. 58．I’m active and it’s ___________ for me to stay at home all day at weekends.（usual） 59．It’s hard work, it’s ____________ (possible) for him to finish it in such a short time. 60．It’s important for us ___________ ( remember ) our family’s telephone numbers. 61．It takes Ann twenty minutes ___________ (go) there. 62．It takes me about two hours ____________ (do) some shopping. 63．To make your DIY perfect, you’d better ___________ (not start) before you get all the tools ready. 64．You’d better ___________ (not cut) your names on the bamboo here. 65．You ___________ (should) spend too much on snacks. 66．—Alice wants to be an actress. —Oh, she ___________ take acting classes. 67．____________ is very common to be afraid of snakes. 68．You’d better ___________ (go) and watch the football match in the sports hall. 69．It’s ________________ (polite) to shout at the old people. 70．Is it important for us students___________ (learn) English well? 71．It is important for us ___________ (learn) how to protect ourselves. 72．It’s too hot in the room. You’d better ________________ (not close) the windows. 73．It’s ___________ (fair) to call 2019-nCov Chinese coronavirus(冠状病毒). 74．It is very nice ___________ (eat) ice cream on hot days in summer. 75．It is important for us __________ (protect) the Earth. 76．You had better ________________ (not drink) wine because you have to drive back home. 77．The novel itself is meaningless, so it’s a waste of time ___________ (read) it several times. 78．It worried her a bit ___________ her hair was turning grey. 79．—In many places, there is not much water. So we should reuse and save it. —That’s right. We should not ___________ it. 80．It’s a great idea ___________ (plant) a tree for your birthday! And It’s fun ___________ (watch) it grow. 三、完成句子：根据汉语提示完成下列句子(本大题共20小题，每小题2分，共40分) 81．阅读之前先浏览一下问题,这是很重要的。 It is important to ________ ________the questions first before ________. 82．到我们的小组课题时间了。 ________ ________ ________ our group project. 83．对我们来说学习如何帮助他人很重要。 ________ ________ ________ for us to learn how to help others. 84．中国很强大能帮助有需要的国家。 China is ________________ to ________________ to countries in need. 85．你最好现在去找他。 You ________ ________ ________ and look for him now. 86．在冬天堆雪人是很有趣的。 ________ ________ to ________________ in winter. 87．你最好不要熬夜，熬夜有害健康。 You _____________________ stay up late. It’s harmful to your health. 88．在冬天，堆雪人是很有趣的。 ________ ________ ________ ________ make snowmen in winter. 89．我们应该尊重彼此的差异。 We _______ respect _______ _______ _______. 90．你最好问一下旅游公司你所有包的总重量。 ________ the travel company about the total weight for all your bags. 91．青少年为零花钱做一个预算是明智的。 It’s ________ of teenagers ________ ________ ________ ________ for their pocket money. 92．你最好锻炼而不是整天看电视。 You had better _____ __________ watching TV all day. 93．她又犯了一个这样的错误，真是太遗憾了。 ________ ________ ________ ________ she made such a mistake again. 94．当众演讲对她来说有困难。 ________________ to make a speech in public. 95．你不尊敬老人，这让人讨厌。 ________ ________ ________ ________ you not to respect the old. 96．买本字典是重要的。 It’s ______________________________a dictionary. 97．选定要穿哪一条裙子去舞会是必要的。 _________ necessary _________ _________ _________ which dress to wear for the ball. 98．你最好多吃蔬菜水果。 You ________ ________ have more vegetables and fruits. 99．你最好不要再上学迟到了。 You’d ______________________________ school again. 100．周末去看电影是令人兴奋的。 ________ ________ ________ to go to see movies at weekends. 8 / 8乐思英语 学科网（北京）股份有限公司 $