Unit 6 Learning by doing 单元语法（情态动词should和had better）-2025-2026学年八年级英语下册单元重难点精练（沪教版）

**基本信息** 聚焦情态动词should与had better的专项突破，通过对比解析、后果暗示法及口诀记忆构建系统方法体系，实现从概念理解到综合运用的逻辑进阶。 **专项设计** |模块|题量/典例|方法提炼|知识逻辑| |----|-----------|----------|----------| |方法引导|3个核心模块（例句解析/关键区别/终极口诀）|对比解析（中性建议vs警告建议）、后果暗示法（"否则"逻辑）、口诀记忆法（动词原形规则）|从具体例句到抽象区别再到口诀强化，形成"感知-辨析-记忆"认知闭环| |题型训练|单项选择30题+完成句子10题|语境辨析法（根据建议语气选情态动词）、句型转换法（否定/疑问句式转换）|从基础用法辨析（选择）到综合运用（转换/翻译），覆盖中考高频考点|

Unit 6 Learning by doing 情态动词should和had better （时间：40分钟，满分：100分） 例句解析： 1. should（中性建议） You should eat more vegetables.（你该多吃蔬菜 → 健康建议） He shouldn't work late every day.（他不该天天熬夜 → 关心性劝阻） 2. had better（带警告的建议） You 'd better leave now, or you'll miss the bus!（最好现在走，否则赶不上公交 → 隐含错过后果） She had better not forget the keys.（她最好别忘带钥匙 → 暗示忘带会锁门外） 关键区别： 用 should 时 → 只是善意提醒（It's a good idea to...） 用 had better 时 → 暗示“不做会倒霉”（There will be trouble if...） ✅ 终极口诀： 祈使句，动打头，省去主语 you； Don't 开头表禁止，please 加在尾或首。 should 建议要温和，had better 带警告； 后者常含“否则”意，动词原形别忘掉！ 一、单项选择(本大题共30小题，每小题2分，共60分) 1．—I have a sore throat. —You ________ drink more hot water and have a good rest. A．should B．shouldn’t C．can’t D．wouldn’t 2．My baby sister is coughing a lot. She _________see a doctor soon. A．should B．may C．can 3．—I have a stomachache. —You ________ eat so much ice cream. A．shouldn’t B．should C．could D．would 4．—I have a really bad toothache. —You ________ see the dentist and get an X-ray. A．should B．could C．may D．would 5．To protect our eyes, every 20 minutes, we ________ rest our eyes and look at something far away. A．should B．dare C．would 6．—Climbing the mountain is so difficult. I felt very tired. —You ________ wear sports shoes. A．should B．dare C．might 7．If you have a sore throat, you ________ drink some warm salt water. A．should B．mustn’t C．can’t D．need 8．You ________ eat too much junk food. It’s bad for your health. A．shouldn’t B．mustn’t C．should D．must 9．If she leaves now, she ________ arrive by 8 p.m. A．could B．should C．mustn’t D．can’t 10．—Why is Daniel so happy today? —He ______ win the writing competition. Look at the prize in his hand. A．may B．can C．must D．should 11．As they get older, teenagers ________ be treated more like adults. A．may B．must C．should D．can 12．—Mum, do you think I _________ take part in the Chemistry competition? — Why not? If I were in your shoes, I certainly would. A．might B．would C．should D．must 13．—Hefei has changed so much these years. It’s now a center for science and technology. —Right! So we ________ protect its environment and develop green spaces for everyone to enjoy. A．can B．may C．should D．need 14．Everyone plays a different role in the family and each member ________ try to play his own role well. A．should B．shouldn’t C．can’t 15．Be careful! The ice is not thick enough. You’d better ________ on it. A．skate B．not to skate C．not skating D．not skate 16．You’d better ________ two days off. You look bad. A．to take B．take C．took D．taken 17．We’d better ________ a room ________ these people to stay in. A．to provide; with B．provide; with C．to provide; for D．provide; for 18．You’d better ________ the link before you click it. A．check B．to check C．checking 19．—I feel tired. —You ________ have a good rest first. A．had better B．would like C．want to D．used to 20．You’d better ________ more about Chinese traditional culture. A．learn B．learning C．to learn D．learned 21．You’d better ________ the computer before you leave the study. A．turn off B．turning off C．turns off D．turned off 22．—You’d better ________ too much fast food. It’s bad for your health. —OK, I’ll eat less. A．not eat B．not to eat C．don’t eat 23．You’d better ________ in bed. It’s bad for your eyes. A．not read B．not to read C．don’t read D．read not 24．You look tired. You’d better ______ a good rest. A．have B．to have C．having 25．You’d better ________ too much junk food. A．not eat B．not to eat C．not eating D．don’t eat 26．You ______ touch the broken gas pipe after the earthquake. It’s extremely dangerous. A．had better not B．need not C．may not D．can not 27．—People ________ talk on mobile phones while they are driving because it’s dangerous. —I agree with you and if they talk on the phone, they must use earphones (耳机). A．needn’t B．shouldn’t C．must 28．You ________ eat too much junk food. It’s bad for your health. A．should B．shouldn’t C．need D．needn’t 29．You ________ eat too much sweet food if you want to stay healthy. A．should B．shouldn’t C．have to D．don’t have to 30．We _________ stay up late. We need enough rest to relax and study better. A．must B．mustn’t C．should D．shouldn’t 二、完成句子(本大题共10小题，每小题4分，共40分) 31．You should drink some warm water. (改为否定句) You ________ drink ________ warm water. 32．Mike should go to the hospital at once. (改为一般疑问句) ________ Mike ________ to the hospital at once? 33．你不应该向他挑战比赛。 You ________ ________ him to a game. 34．他可能在九点前到达那儿。 He ________ ________ there before nine o’clock. 35．We should prepare emergency supplies to deal with natural disasters.（改为一般疑问句） ________ we ________ emergency supplies to deal with natural disasters? 36．如果你在生病时外出，你最好戴上口罩。 If you’re sick, ________ ________ wear a mask when you go out. 37．你最好向老师寻求帮助。 ________ ________ ask the teacher for help. 38．You had better take a walk after dinner to relax. (改为同义句) You ________ ________ a walk after dinner to relax. 39．We should take reading notes while reading. (用had better改写) We ________ ________ ________ reading notes while reading. 40．你最好不要吃太多垃圾食品。 You ________ ________ ________ ________ too much junk food. 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $ Unit 6 Learning by doing 情态动词should和had better （时间：40分钟，满分：100分） 例句解析： 1. should（中性建议） You should eat more vegetables.（你该多吃蔬菜 → 健康建议） He shouldn't work late every day.（他不该天天熬夜 → 关心性劝阻） 2. had better（带警告的建议） You 'd better leave now, or you'll miss the bus!（最好现在走，否则赶不上公交 → 隐含错过后果） She had better not forget the keys.（她最好别忘带钥匙 → 暗示忘带会锁门外） 关键区别： 用 should 时 → 只是善意提醒（It's a good idea to...） 用 had better 时 → 暗示“不做会倒霉”（There will be trouble if...） ✅ 终极口诀： 祈使句，动打头，省去主语 you； Don't 开头表禁止，please 加在尾或首。 should 建议要温和，had better 带警告； 后者常含“否则”意，动词原形别忘掉！ 一、单项选择(本大题共30小题，每小题2分，共60分) 1．—I have a sore throat. —You ________ drink more hot water and have a good rest. A．should B．shouldn’t C．can’t D．wouldn’t 【答案】A 【详解】句意：——我喉咙痛。——你应该多喝热水并好好休息。 should应该；shouldn’t不应该；can’t不能；wouldn’t将不会。根据“I have a sore throat”可知，对方生病了，此处是给出建议，表示“应该”多喝热水并休息，应填should。 2．My baby sister is coughing a lot. She _________see a doctor soon. A．should B．may C．can 【答案】A 【详解】句意：我的小妹妹咳嗽得很厉害。她应该尽快去看医生。 should应该；may可能；can能。根据“My baby sister is coughing a lot.”可知，妹妹咳嗽得厉害，所以此处表示“应该”尽快去看医生，应填should。 3．—I have a stomachache. —You ________ eat so much ice cream. A．shouldn’t B．should C．could D．would 【答案】A 【详解】句意：——我肚子疼。——你不应该吃这么多冰淇淋。 shouldn’t不应该；should应该；could可以；would将会。根据“I have a stomachache.”可知身体不舒服，推测是因为吃太多冰淇淋导致的，所以建议不应该吃这么多。应填shouldn’t。 4．—I have a really bad toothache. —You ________ see the dentist and get an X-ray. A．should B．could C．may D．would 【答案】A 【详解】句意：——我牙疼得很厉害。——你应该去看牙医并拍个X光片。 should应该；could能够；may可能；would将要。根据上句“I have a really bad toothache.”可知对方牙疼严重，下句是给出建议，应填should。 5．To protect our eyes, every 20 minutes, we ________ rest our eyes and look at something far away. A．should B．dare C．would 【答案】A 【详解】句意：为了保护眼睛，我们应该每20分钟休息一下眼睛，看看远处的东西。    should应该（表建议、义务）；dare敢（表胆量）；would将（表过去将来或意愿）。此处是针对保护眼睛提出的建议，应用should。 6．—Climbing the mountain is so difficult. I felt very tired. —You ________ wear sports shoes. A．should B．dare C．might 【答案】A 【详解】句意：——爬山太难了。我感到很累。——你应该穿运动鞋。 should应该；dare敢；might可能。根据“Climbing the mountain is so difficult. I felt very tired.”可知说话人表示爬山困难且累，对方是在给出建议，建议应该穿运动鞋。应填should。 7．If you have a sore throat, you ________ drink some warm salt water. A．should B．mustn’t C．can’t D．need 【答案】A 【详解】句意：如果你喉咙痛，你应该喝一些温盐水。 should应该；mustn’t禁止；can’t不能；need需要。根据“If you have a sore throat”可知此处是在针对病情给出建议，喝温盐水是合理的建议措施，应用should表示“应该”。 8．You ________ eat too much junk food. It’s bad for your health. A．shouldn’t B．mustn’t C．should D．must 【答案】A 【详解】句意：你不应该吃太多垃圾食品。这对你的健康有害。 shouldn’t不应该；mustn’t禁止；should应该；must必须。根据“It’s bad for your health.”可知，吃太多垃圾食品对健康有害，应给出否定的建议，所以用shouldn’t。 9．If she leaves now, she ________ arrive by 8 p.m. A．could B．should C．mustn’t D．can’t 【答案】B 【详解】句意：如果她现在出发，她应该能在晚上8点前到达。 could可能；should应该；mustn’t禁止；can’t不可能。根据“If she leaves now”可知是根据条件进行的合理推测，表示预期结果，should符合语境。 10．—Why is Daniel so happy today? —He ______ win the writing competition. Look at the prize in his hand. A．may B．can C．must D．should 【答案】C 【详解】句意：——为什么丹尼尔今天这么开心？——他一定是在写作比赛中获胜了。看他手中的奖品。 考查情态动词。may也许； can可能；must一定；should应该。根据“He...win the writing competition. Look at the prize in his hand.”可知，他手中拿着奖品，应该“一定”是在写作比赛中获胜了。故选C。 11．As they get older, teenagers ________ be treated more like adults. A．may B．must C．should D．can 【答案】C 【详解】句意：随着他们年龄的增长，青少年应该被更像成年人一样对待。   考查情态动词辨析。may可能；must必须；should应该；can能够。根据“As they get older”可知，这里说的是随着青少年年龄增长，从常理角度来讲“应该”被更像成年人一样对待，should符合语境，故选C。 12．—Mum, do you think I _________ take part in the Chemistry competition? — Why not? If I were in your shoes, I certainly would. A．might B．would C．should D．must 【答案】C 【详解】句意：——妈妈，你认为我应该参加化学比赛吗？——为什么不呢？如果我是你的话，我一定会的。 考查情态动词用法。might可能；would会；should应该；must必须。根据“If I were in your shoes, I certainly would.” 可推断出前句询问是否“应该”做某事，因此should符合句意。故选C。 13．—Hefei has changed so much these years. It’s now a center for science and technology. —Right! So we ________ protect its environment and develop green spaces for everyone to enjoy. A．can B．may C．should D．need 【答案】C 【详解】句意：——合肥这些年变化太大了。现在它是一个科学技术中心。——是的！所以我们应该保护它的环境并开发绿色空间供每个人享受。 can能，可以；may可能，可以；should应该；need需要。根据对话语境可知，鉴于合肥的发展成就，保护环境和开发绿色空间是大家应尽的责任，表示“应该”做某事用should。 14．Everyone plays a different role in the family and each member ________ try to play his own role well. A．should B．shouldn’t C．can’t 【答案】A 【详解】句意：每个人在家庭中都扮演着不同的角色，每个成员应该努力扮演好自己的角色。 should应该；shouldn’t不应该；can’t不能。根据“Everyone plays a different role in the family”可知每个人都有自己的角色，因此推测每个成员都应该努力扮演好自己的角色，表责任或建议。应填should。 15．Be careful! The ice is not thick enough. You’d better ________ on it. A．skate B．not to skate C．not skating D．not skate 【答案】D 【详解】句意：小心！冰不够厚。你最好不要在上面滑冰。 根据“The ice is not thick enough.”可知冰层太薄，建议不要滑冰。had better后接动词原形，否定形式为had better not do sth.。 16．You’d better ________ two days off. You look bad. A．to take B．take C．took D．taken 【答案】B 【详解】句意：你最好请两天假。你看起来状态不好。 根据“You’d better”可知，had better意为“最好”，后接动词原形take。 17．We’d better ________ a room ________ these people to stay in. A．to provide; with B．provide; with C．to provide; for D．provide; for 【答案】D 【详解】句意：我们最好为这些人提供一个房间住。 had better后接动词原形，排除A、C；provide sth. for sb. 意为“为某人提供某物”，provide sb. with sth.意为“提供给某人某物”。句中a room是物，these people是人，物在人前，应用provide sth. for sb.结构。 18．You’d better ________ the link before you click it. A．check B．to check C．checking 【答案】A 【详解】句意：在你点击链接之前，你最好检查一下这个链接。 You’d better 是You had better的缩写，意为“最好”，其后接动词原形。应填check。 19．—I feel tired. —You ________ have a good rest first. A．had better B．would like C．want to D．used to 【答案】A 【详解】句意：——我感到很累。——你最好先好好休息一下。 had better最好，后接动词原形，用于提出建议；would like想要，后接动词不定式；want to想要，后接动词原形；used to过去常常，表示过去习惯。根据“I feel tired”可知，此处是后者给前者提建议。应填had better。 20．You’d better ________ more about Chinese traditional culture. A．learn B．learning C．to learn D．learned 【答案】A 【详解】句意：你最好多了解一些中国传统文化。 had better意为“最好”，后接动词原形。 21．You’d better ________ the computer before you leave the study. A．turn off B．turning off C．turns off D．turned off 【答案】A 【详解】句意：你最好在离开书房前关掉电脑。 “you’d better”是“you had better”的缩写，后面接动词原形，用来提出建议或劝告。 22．—You’d better ________ too much fast food. It’s bad for your health. —OK, I’ll eat less. A．not eat B．not to eat C．don’t eat 【答案】A 【详解】句意：——你最好不要吃太多快餐。这对你的健康有害。——好的，我会少吃点。 考查固定搭配。固定短语“had better not do sth.”表示“最好不要做某事”，后接动词原形，因此否定形式应为“had better not eat”。故选A。 23．You’d better ________ in bed. It’s bad for your eyes. A．not read B．not to read C．don’t read D．read not 【答案】A 【详解】句意：你最好不要躺在床上看书。这对你的眼睛有害。 考查情态动词的用法。had better (not) do sth.“最好（不）做某事”，是固定搭配，后接动词原形；根据“It’s bad for your eyes.”可知，此处指最好不要躺在床上看书。故选A。 24．You look tired. You’d better ______ a good rest. A．have B．to have C．having 【答案】A 【详解】句意：你看起来很累。你最好好好休息一下。 考查had better的用法。had better 后接动词原形，表示“最好做某事”。故选A。 25．You’d better ________ too much junk food. A．not eat B．not to eat C．not eating D．don’t eat 【答案】A 【详解】句意：你最好不要吃太多垃圾食品。 考查“had better”的固定用法。“had better”后接动词原形，表示“最好做某事”，其否定形式是在动词原形前加“not”，即“had better not do sth.”表示“最好不要做某事”。故选A。 26．You ______ touch the broken gas pipe after the earthquake. It’s extremely dangerous. A．had better not B．need not C．may not D．can not 【答案】A 【详解】句意：地震后你最好不要触碰破损的燃气管，这极其危险。 考查情态动词短语辨析。had better not最好不要；need not不必；may not可能不；can not不能。根据“It’s extremely dangerous”可知，这是强烈的劝告，应用had better not表示“最好不要做”。故选A。 27．—People ________ talk on mobile phones while they are driving because it’s dangerous. —I agree with you and if they talk on the phone, they must use earphones (耳机). A．needn’t B．shouldn’t C．must 【答案】B 【详解】句意：——人们开车时不应该打电话，因为这很危险。——我同意你的观点，如果他们打电话，必须使用耳机。 needn’t不必；shouldn’t不应该；must必须。根据“because it’s dangerous”可知，开车打电话存在安全隐患，因此是不应该做的事情，应填shouldn’t。 28．You ________ eat too much junk food. It’s bad for your health. A．should B．shouldn’t C．need D．needn’t 【答案】B 【详解】句意：你不应该吃太多垃圾食品。这对你的健康有害。 should应该；shouldn’t不应该；need需要；needn’t不必。根据“It’s bad for your health.”可知，吃太多垃圾食品对健康有害，所以建议是不应该吃太多。 29．You ________ eat too much sweet food if you want to stay healthy. A．should B．shouldn’t C．have to D．don’t have to 【答案】B 【详解】句意：如果你想保持健康，你不应该吃太多甜食。   should应该；shouldn’t不应该；have to不得不；don’t have to不必。根据“to stay healthy”及健康常识可知，过量甜食对健康不利，因此应避免，shouldn’t符合语境。 30．We _________ stay up late. We need enough rest to relax and study better. A．must B．mustn’t C．should D．shouldn’t 【答案】D 【详解】句意：我们不应该熬夜。我们需要足够的休息来放松和学习得更好。 must必须；mustn't禁止；should应该；shouldn't不应该。根据后句“We need enough rest to relax and study better.”可知，为了有足够的休息来放松和学习更好，不应该熬夜，此处表示建议，应选shouldn’t。 二、完成句子(本大题共10小题，每小题4分，共40分) 31．You should drink some warm water. (改为否定句) You ________ drink ________ warm water. 【答案】 shouldn’t any 【详解】句意：你应该喝点温水。should为情态动词，改否定句，直接在其后加not，缩写形式为shouldn’t；some多用于肯定句，需改为any。 32．Mike should go to the hospital at once. (改为一般疑问句) ________ Mike ________ to the hospital at once? 【答案】 Should go 【详解】句意：迈克应该立刻去医院。句中含有情态动词“should”，变为一般疑问句时，需将其提至句首，首字母大写，构成疑问语序，后接动词原形go。 33．你不应该向他挑战比赛。 You ________ ________ him to a game. 【答案】 shouldn’t challenge 【详解】原句中“不应该”和“挑战”是关键词；表示“不应该”用shouldn’t；表示“挑战某人某事”的固定搭配是challenge sb to sth，情态动词后接动词原形。 34．他可能在九点前到达那儿。 He ________ ________ there before nine o’clock. 【答案】 should arrive 【详解】表示“可能”的情态动词用should。arrive动词，“到达”，情态动词后接动词原形。故填should；arrive。 35．We should prepare emergency supplies to deal with natural disasters.（改为一般疑问句） ________ we ________ emergency supplies to deal with natural disasters? 【答案】 Should prepare 【详解】句意：我们应该准备应急物资，以应对自然灾害。含情态动词的句子变一般疑问句时，直接把情态动词提到句首并首字母大写，句中的实义动词保持原形不变。故填Should；prepare。 36．如果你在生病时外出，你最好戴上口罩。 If you’re sick, ________ ________ wear a mask when you go out. 【答案】 you’d better 【详解】根据中文“你最好……”，had better“最好”，you“你”，第一个空填“you’d”是“you had”的缩写。 37．你最好向老师寻求帮助。 ________ ________ ask the teacher for help. 【答案】 You’d better 【详解】原句中“你最好”是关键词。表示“你”的单词是you，作主语，首字母大写；表示“最好”的短语是had better，you和had可以缩写为you’d。 38．You had better take a walk after dinner to relax. (改为同义句) You ________ ________ a walk after dinner to relax. 【答案】 should take 【详解】句意：你最好晚饭后散散步来放松。had better do表示“建议”，同义表达可以用should代替，其后用动词原形，所以填should take。 39．We should take reading notes while reading. (用had better改写) We ________ ________ ________ reading notes while reading. 【答案】 had better take 【详解】句意：我们应该在阅读时做读书笔记。原句中的“should”表示“应该”，用来提出建议或劝告。而“had better”意为“最好”，同样用于提出建议或警告，其后接动词原形。 40．你最好不要吃太多垃圾食品。 You ________ ________ ________ ________ too much junk food. 【答案】 had better not eat 【详解】原句中“最好不要”是关键词，“最好”是固定结构：had better ，否定形式是had better not。本句是一般现在时，had better没有人称变化，后跟动词原形，eat“吃”是动词。故填had；better；not；eat。 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $