内容正文:
外研版八年级下册 Unit 3 语法精讲&专项练习卷
本单元核心语法为情态动词 should /shouldn’t、have to /don’t have to、must /mustn’t,聚焦 “团队合作” 场景,表达建议、劝告、义务、禁止四类语气。
一、情态动词基本特征(必记)
1. 后接动词原形(无人称、数的变化)。
2. 否定:情态动词 +not(缩写:shouldn’t, don’t have to, mustn’t)。
3. 疑问:情态动词提前至句首。
二、核心情态动词精讲(附教材例句)
1. should /shouldn’t(建议・委婉)
· 含义:应该 / 不应该(表建议、劝告、责任,语气友好)。
· 结构:
2. 肯定:主语 + should + 动词原形
2. 否定:主语 + shouldn’t + 动词原形
2. 疑问:Should + 主语 + 动词原形?
· 教材例句:
· You should listen to your teammates carefully.(你应该认真倾听队友。)
· You shouldn’t keep silent when you disagree.(有分歧时不应沉默。)
· Should we discuss the plan first?(我们应该先讨论计划吗?)
2. have to /don’t have to(义务・客观)
· 含义:不得不 / 不必(表客观要求、规则,非个人意愿)。
· 结构(有人称 / 时态变化:have to→has to→had to):
· 肯定:主语 + have/has to + 动词原形
· 否定:主语 + don’t/doesn’t have to + 动词原形(=needn’t,“不必”)
· 疑问:Do/Does + 主语 + have to + 动词原形?
· 教材例句:
3. A leader has to take responsibility.(领导者必须承担责任。)
3. You don’t have to solve all problems alone.(你不必独自解决所有问题。)
3. Did you have to work overtime yesterday?(你昨天不得不加班吗?)
3. must /mustn’t(义务・强烈 / 禁止)
· 含义:必须 / 禁止(表主观意志、规定,语气最强;mustn’t 表 “绝对不可以”)。
· 结构:
2. 肯定:主语 + must + 动词原形
2. 否定:主语 + mustn’t + 动词原形
2. 疑问:Must + 主语 + 动词原形?
· 教材例句:
3. We must trust each other in a team.(团队中必须互相信任。)
3. You mustn’t give up easily.(绝不能轻易放弃。)—Must I finish the task today?—Yes, you must. / No, you needn’t/don’t have to.(×mustn’t)
三、易混辨析(高频考点)
1. should vs must vs have to
表格
情态动词
核心差异
语气
否定含义
should
建议、劝告(讲道理)
委婉
shouldn’t(不应该)
must
主观必须、规定(说话人意志)
强烈
mustn’t(禁止)
have to
客观不得不(外部条件)
客观
don’t have to(不必)
2. mustn’t vs don’t have to
· mustn’t:禁止,绝对不能做(=be not allowed to)。
1. You mustn’t talk in class.(课堂上禁止讲话。)
· don’t have to:不必,没必要做(=needn’t)。
2. You don’t have to wait for me.(你不必等我。)
四、单元高频句型(语法应用)
1. It’s + adj. + to do sth.(做某事是…… 的)
2. It’s important to communicate with teammates.(与队友沟通很重要。)
2. What if…?(如果…… 怎么办?表假设)
2. What if we fail the game?(如果我们比赛输了怎么办?)
3. had better (not) do sth.(最好(不)做某事,表强烈建议)
2. You had better support your partner.(你最好支持你的搭档。)
五、总结(口诀速记)
· Should 建议委婉说,后接原形别记错;
· Have to 客观迫,否定不必 don’t have to;
· Must 主观必须做,禁止要用 mustn’t;
· 情态动词无三单,否定 not 后面搁。
外研版八年级下册Unit 3 What makes a great team 语法专项卷(含答案+解析)
(考试时间:30分钟 满分:100分)
班级:________ 姓名:________ 得分:________
一、基础层(每题2分,共30分)—— 核心语法基础应用
考点1:should / shouldn’t(建议、劝告)
用should或shouldn’t填空,完成句子。
1. You ________ listen to your teammates carefully when they talk.(应该)
2. He ________ keep silent if he has different ideas.(不应该)
3. ________ we discuss the team plan together first?(应该)
4. You ________ be rude to your partners. It’s bad for team work.(不应该)
5. She ________ ask for help when she can’t finish the task alone.(应该)
考点2:have to / don’t have to(客观义务、不必)
用have to、has to、don’t have to、doesn’t have to填空,注意人称和时态。
1. I ________ finish my homework before 8 o’clock. My mom asks me to do so.(不得不)
2. He is a leader, so he ________ take more responsibility.(不得不)
3. You ________ worry about me. I can take care of myself.(不必)
4. They ________ work overtime today. The task is easy to finish.(不必)
5. My sister ________ get up early every morning because she has to go to school.(不得不)
考点3:must / mustn’t(主观义务、禁止)
用must或mustn’t填空,完成句子。
1. We ________ trust each other in a great team.(必须)
2. You ________ give up easily when you meet difficulties.(禁止)
3. Students ________ follow the team rules during the activity.(必须)
4. You ________ talk loudly in the library. It’s against the rules.(禁止)
5. We ________ help the teammate who is in trouble.(必须)
二、提升层(每题3分,共30分)—— 易混辨析+句型转换
考点4:易混情态动词辨析(should / must / have to)
选择合适的情态动词(短语)填空,每个词(短语)仅用一次。
should must have to don’t have to mustn’t
1. You ________ finish the task today. It’s a rule from our teacher.(客观要求)
2. I think you ________ ask your teacher for advice. She is very helpful.(建议)
3. We ________ be quiet in the meeting room. It’s a strict rule.(禁止)
4. He ________ go to the doctor. He feels very well now.(不必)
考点1:should / shouldn’t
1. You should listen to your teammates carefully when they talk.
解析:表达建议或应该做的事,用 should + 动词原形
2. He shouldn’t keep silent if he has different ideas.
解析:“不应该”用 shouldn’t,表示不赞成保持沉默。
3. Should we discuss the team plan together first?
解析:Should 提前构成一般疑问句,询问建议。
4. You shouldn’t be rude to your partners. It’s bad for team work.
解析:粗鲁行为不合团队精神,用 shouldn’t 表示劝阻。
5. She should ask for help when she can’t finish the task alone.
解析:建议她在无法独立完成时寻求帮助,用 should。
考点2:have to / don’t have to
1. I have to finish my homework before 8 o’clock. My mom asks me to do so.
解析:妈妈要求,属于客观义务,主语 I 用 have to。
2. He is a leader, so he has to take more responsibility.
解析:作为队长的客观责任,主语 He 三单,用 has to。
3. You don’t have to worry about me. I can take care of myself.
解析:“不必”用 don’t have to,表示没有客观必要。
4. They don’t have to work overtime today. The task is easy to finish.
解析:任务简单,没必要加班,主语 They 用 don’t have to。
5. My sister has to get up early every morning because she has to go to school.
解析:上学是客观需求,主语三单用 has to。
考点3:must / mustn’t
1. We must trust each other in a great team.
解析:主观上认为信任是团队必需的,用 must。
2. You mustn’t give up easily when you meet difficulties.
解析:禁止轻易放弃,用 mustn’t 表示强烈禁止。
3. Students must follow the team rules during the activity.
解析:遵守规则是内在义务,用 must。
4. You mustn’t talk loudly in the library. It’s against the rules.
解析:违反规定,禁止行为,用 mustn’t。
5. We must help the teammate who is in trouble.
解析:从团队精神出发,主观上必须帮助,用 must。
二、提升层(每题3分,共30分,仅呈现已提供部分)
考点4:易混情态动词辨析
题目
答案
解析
1. You ______ finish the task today. It’s a rule from our teacher.(客观要求)
have to
来自老师的规定属于外界客观要求,用 have to。
2. I think you ______ ask your teacher for advice. She is very helpful.(建议)
should
表示提建议,用 should。
3. We ______ be quiet in the meeting room. It’s a strict rule.(禁止)
mustn’t
严格规则表示“禁止”,用 mustn’t。
4. He ______ go to the doctor. He feels very well now.(不必)
doesn’t have to
主语 He 三单,“不必”为 doesn’t have to。原表格给的词是 don’t have to,需根据人称变形。(若原题要求固定用所给词填空,此处会出现 don’t have to 与人称不匹配的问题,但根据语法正确形式应为 doesn’t have to)
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