Itis形容词todo句型-备战2025-2026学年七年级英语上学期期末语法全解（沪教牛津版）

ENGL凵ISH-初一系列资料（沪教牛津版） Chapter1Itis+形容词+todo..句型 考频分析 tis+形容词+todo.句型是中考英语句法的重要模块，考频占句法总量的15%左右，贯穿试卷多个核 心题型：单项选择(1-2题)、完形填空(2-3题)、语法填空(1-2题)、书面表达（核心考察，直接影响句 子结构的规范性与表达的准确性)。在语境应用类题目中，该句型中形容词的选择及不定式结构的搭配往 往是解题关键。 考查内容 中考对tis+形容词+todo.句型的考察聚焦三大维度，覆盖基础用法与语境应用： ·形容词搭配：描述事物特征类(important,necessary等)、表达个人感受类(interesting,exciting等)形 容词的准确选用； ·句式结构：基本句型框架(It is+adj.+to do sth.)的识别与补全，形式主语t与真正主语todo不定式的 逻辑关系； ·语境应用：结合具体场景判断句型适用情境，正确运用该句型表达观点、建议或描述客观情况。 精讲精练 知识点一：tis+形容词+todo..句型 ·基本结构(t作形式主语，todo不定式为真正主语) -结构公式：tis+形容词+to do sth, -功能说明：当不定式短语较长时，用it作形式主语，避免句子头重脚轻，真正主语“to do sth.”后置 -例句：It is easy to learn English.(真正主语为to learn English,意为“学英语很简单”)口ltis important to help others.(真正主语为to help others,意为“帮助别人很重要”) ·常见形容词搭配 -描述难易程度：easy(容易的)、difficult(困难的)、hard(艰难的)→例句：It is difficult to solve this problem. -描述重要性/必要性：important(重要的)、necessary(必要的)、useful(有用的)→例句：It is necessary to wear a mask in public. 一描述情感态度：happy(开心的)、sad(难过的)、interesting(有趣的)→例句：It is interesting to read storybooks ·句式转换（否定句与疑问句） -否定句：在be动词后加not→It is not easy to finish the work.(完成这项工作不容易) -一般疑问句：将be动词提前→Is it important to study hard?(努力学习重要吗？) -特殊疑问句：疑问词+be动词+it+形容词+to do sth.→How is it to live in the city'?(住在城市感觉 怎么样？) 【即学即练】 1.【基本结构识别】下列句子中，符合tis+形容词+todo..句型的是？ A.Learn English is easy. B.It is easy to learn English. C.It easy to learn English. D.It is easy learn English. 2.【否定句转换】将”It is important to help others.”改为否定句： 3.【形容词选择】tis_to swim in the river alone.(选择正确的词) A.danger B.dangerous C.dangerously D.dangers 4.【一般疑问句转换】将"'It is interesting to read storybooks..”改为一般疑问句： 5.【特殊疑问句】对"It is hard to live in the countryside.”中的hard提问，正确的是？ A.What is it to live in the countryside? B.How is it to live in the countryside? C.Why is it to live in the countryside? D.When is it to live in the countryside? 初一|英语|沪教牛津版 ENGLISH-初一系列资料（沪教牛津版） 知识点二：形容词的选择与句型应用 ·形容词的基本功能（描述事物特征或状态） 1.常见形容词分类 -描述性质：happy(开心的)、difficult(困难的)、important(重要的)、easy(简单的)、dangerous (危险的) -描述感受：exciting(令人兴奋的)、boring(无聊的)、surprising(令人惊讶的)、relaxing(令人 放松的) 2.句型结构 -基本框架：tis+形容词+to do sth.(it作形式主语，真正主语是to do sth.) 一例句： -口It is easy to learn English.(easy描述“学英语”的性质，形式主语it代替to learn English) -口It is dangerous to swim in the river.(dangerous描述“在河里游泳”的危险性) ·形容词的固定搭配与易错点 1.只能用于此句型的形容词 -necessary(必要的)、impossible(不可能的)、possible(可能的)、useful(有用的) 一例句： -口It is necessary to brush teeth twice a day.(必须每天刷两次牙，necessary强调必要性) -口It is impossible to finish the work in one hour..(一小时内完成工作不可能，impossible表否定意 义) 2.避免常见错误（误用副词） -错误：It is quickly to run..(quickly是副词，不能用在此句型) -正确：It is quick to run.(quick是形容词，符合tis+形容词+todo结构) ·否定形式与疑问形式 1.否定句 -结构：It is not+形容词+to do sth.(在is后加not) -例句：It is not difficult to solve the problem.(解决这个问题不难) 2.一般疑问句 -结构：lsit+形容词+to do sth.？(将is提到句首)》 -例句：Is it important to study hard'？(努力学习重要吗？) 3.特殊疑问句（对形容词提问，用how) -结构：How+isit+to do sth.? -例句：How is it to live in Beijing?(住在北京怎么样？) ·中考高频考点（形容词辨析与语境应用） 1.易混形容词对比 -interesting(令人感兴趣的，修饰物)vs interested(感兴趣的，修饰人) -例句：It is interesting to read books.(读书令人感兴趣，用interesting修饰to read books) 2.语境选择技巧（根据句意判断情感或性质） -题目：It is to help old people.(A.kind B.kindly) -解析：A.kind(形容词，符合句型结构；kindly是副词，排除B) -答案：A 知识点三：tis+形容词+todo..句型 ·基本结构（核心框架） -结构公式：tis+形容词+to do sth. 一用法说明：t作形式主语，真正主语是后面的不定式短语to do sth.,用于表达“做某事具有某种性质 或特征”。 -例句：It is easy to answer this question.(回答这个问题很简单。) ·形容词分类（中考高频） 1.描述事物特征的形容词： -important(重要的)→It is important to follow traffic rules..(遵守交通规则很重要。) -necessary(必要的)→t is necessary to drink enough water every day.(每天喝足够的水是必要 的。) -difficult(困难的)→It is difficult to learn math well.(学好数学很难。) -easy(容易的)→It is easy to make friends with him.(和他交朋友很容易。) -interesting(有趣的)→t is interesting to read storybooks.(读故事书很有趣。) 2.描述人的情感态度的形容词： -happy(开心的)→It is happy to help others.(帮助别人很开心。) -glad(高兴的)→t is glad to meet you here.(在这里见到你很高兴。) -sad(难过的)→It is sad to hear the bad news.(听到这个坏消息很难过。) ·句式转换（中考语法填空句型转换考点） 1.否定句：在is后加not→It is not easy to finish the work alone.(独自完成这项工作不容易。) 2.一般疑问句：将is提到句首→Is it important to learn a foreign language?(学一门外语重要吗？) 3.特殊疑问句：用特殊疑问词(how/why/what等)+isit+形容词+to do sth.? -→How is it to live in the countryside？(住在乡下怎么样？) -→hy is it necessary to exercise every day?(为什么每天锻炼是必要的？) ·常见错误对比（中考易错点） 1.误用形式主语： -错误：To learn English well is important.(不定式短语作主语，句子结构头重脚轻，不推荐) -正确：It is important to learn English well.(用It作形式主语，符合英语表达习惯) 2.形容词与不定式搭配不当： -错误：It is quickly to run fast..(quickly是副词，此处需用形容词quick) -正确：It is quick to run fast..(跑得快是迅速的。) ·中考真题链接（模拟题型） -单项选择：tis_to swim in the river alone.(2023年上海中考模拟题) A.danger B.dangerous C.safely D.difficult -答案：B -解析：句意为“独自在河里游泳是危险的”，此处需用形容词dangerous,构成tis+adj.+todo结 构。 初一|英语|沪教牛津版 ENGLISH初一系列资料（沪教牛津版） 考法一：基本句型结构识别与应用 ·核心：掌握”tis+形容词+to do sth.”句型的基本结构，能判断句子是否符合该结构或补全缺失成分 ·真题1（语法填空）： It is important_(learn)English well. 一答案：to learn解析：该句为”tis+形容词+to do sth”句型，缺少真正主语不定式部分，所以填to learn. ·真题2（单项选择）： -_is necessary to finish homework on time. A.This B.That C.It D.He -答案：C解析：此处需要形式主语，构成”tis+形容词+to do sth.”句型，t作形式主语，符合语法 规则，其他选项不能作形式主语。 考法二：形容词选择与句型转换综合应用 ·核心：结合”ts+形容词+todo.”句型的结构要求，根据语境选择正确形容词，并进行否定句或疑问句 转换 ·真题1（句型转换）： -It is useful to learn computer skills..(改为否定句) -答案：It is not useful to learn computer skills解析：根据否定句结构”在be动词后加not”,直接在is 后加not即可。 ·真题2（单项选择）： It is_to play football in the street. A.danger B.dangerous C.safely D.interested 一答案：B解析：句型要求使用形容词，A是名词，C是副词，排除；D修饰人，此处描述”在街上踢足 球”这件事的性质，用dangerous(危险的)符合语境。 考法三：tis+形容词todo..句型综合应用（形容词辨析、句式转换与语境搭 配) ·核心：结合形容词分类（描述性质/感受）、句式转换（否定疑问）及语境选择，准确完成句型应用 ·真题1（单项选择）： It is_to watch the football match.We all feel excited. A.excited B.exciting C.excitedly D.excite 一答案：B解析：句型为tis+形容词+to do sth.,需用形容词，排除C(副词)和D(动词)；exciting 表示“令人兴奋的”，修饰事物(to watch the football match),excited修饰人，此处描述“看足球比 赛”的特征，用exciting。 ·真题2（语法填空）： -It is not_(difficulty)to learn English well if you practice every day. 一答案：difficult解析：句型为tis+形容词+to do sth,此处需用形容词，difficulty是名词，其形容词 形式为difficult,句意为“如果你每天练习，学好英语不难”。 初一丨英语|沪教牛津版 ENGLISH-初一系列资料（沪教牛津版） 解题小妙招 t句型妙招 基本结构tis形，后接todo莫忘记； 形式主语用t,形容词后不定式； 否定直接be后加not,疑问be动词提前移； 形容词辨性质感受，事物用-ing人用-ed; 名词副词皆排除，形容词形式要牢记； 结合语境选答案，语法填空需变形。 真题演练 演练一：单项选择试题（共10题） 1.It is_to help others when they are in need. A.kind B.kindly C.kindness D.kinds 2._is important to get up early in the morning. A.This B.That C.It D.He 3.It is to swim in the deep river alone A.danger B.dangerous C.safely D.difficult 4.How _it to travel by plane? A.is B.are C.was D.were 5.It is not_to finish the work in two hours A.easy B.easily C.ease D.easier 6.It is to read storybooks before bed. A.interested B.interesting C.interest D.interests 7.Is it_to learn Chinese characters? A.hard B.hardly C.hardness D.harden 8.It is_to follow traffic rules on the road. A.necessary B.necessarily C.necessity D.need 9.is boring to stay at home all day. A.What B.Which C.It D.Who 10.It is_to make friends with honest people A.pleasure B.pleased C.pleasant D.pleasing 演练二：填空试题（共10题） 1.It is easy_(answer)this question. 2.It is not difficult _(solve)the problem. 3.Is it important_(study)math every day? 4.It is interesting_(watch)cartoons 5.It is necessary_(wear)warm clothes in winter. 6.How_(be)it to live in the countryside? 7.It is dangerous-(play)with fire. 8.It is not useful(waste)time. 9.It is happy_(help)my mother with housework. 10.Is it possible_(finish)the task tomorrow? 演练三：语法填空试题（共10空） Reading books is a good habit.Many people say it is_(1)(interest)to read different kinds of books.For students,it is_(2)(necessary)to read textbooks,but it is also_(3)(relax)to read storybooks or novels. It is not_(4)(hard)to find time for reading if you plan your day well. It is_(5)(help)to read English books to improve your language skills.Some students think it is_(6) (difficulty)to read in English,but it is_(7)(important)to keep practicing.Is it_(8)(possible)to read one book a week?Yes,it is! Remember,it is never too late_(9)(start)reading.It is_(10)(happy)to share books with friends and talk about your favorite stories. 答案 演练一：单项选择 1.A2.C3.B4.A5.A6.B7.A8.A9.C10.C 演练二：填空试题 1.to answer 2.to solve 3.to study 4.to watch 5.to wear 6.is 7.to play 8.to waste 9.to help 10.to finish 演练三：语法填空 1.interesting 2.necessary 3.relaxing 4.hard 5.helpful 6.difficult 7.important 8.possible 9.to start 10.happy 初一丨英语|沪教牛津版