Unit4 语法专项课件 情态动词课件 2025-2026学年冀教版英语八年级上册

教学课件 冀教英语八年级上册 Unit4 语法专项—— 情态动词 全解精讲+分层练习 1 学习目标 1.掌握情态动词的定义与基本规则 2.熟练运用 can / may / must / should 3.区分 mustn’t 与 needn’t 用法 4.掌握否定句与疑问句变换 5.能在语境中正确使用情态动词 什么是情态动词 本身有词义，不能单独作谓语 必须与动词原形连用 无人称和数的变化 用来表达能力、许可、建议、必要性 属于助动词，辅助谓语表达语气 核心语法规则 1.后接动词原形，不加 -s/-ing/-ed 2.否定句：直接加 not，不用 do/does 3.疑问句：直接提前，不用助动词 4.不能单独回答，必须搭配动词 情态动词 can（1） 核心含义：能力、许可 表能力：能、会做某事 例句：I can swim. 我会游泳。 表许可：可以做某事 例句：Can I open the door? 情态动词 can（2） 否定形式：can’t = cannot 含义：不能、不可以 例句：She can’t drive a car. 一般疑问句：Can + 主语 + 动词原形？ 回答：Yes, ...can. /No, ...can’t. 情态动词 may（1） 核心含义：许可、可能性 表许可：可以（更礼貌） 例句：May I come in? 表可能性：可能、也许 例句：It may snow tomorrow. 情态动词 may（2） 否定形式：may not 含义：不可以、可能不 例句：You may not play games. 疑问句：May + 主语 + 动词原形？ 肯定回答：Yes, ...may / can. 否定回答：No, ...can’t. 情态动词 must（1） 核心含义：必须、肯定推测 表必须：务必、一定要 例句：We must obey rules. 表推测：肯定、一定 例句：He must be at home. 情态动词 must（2） 否定形式：mustn’t 含义：禁止、不准 例句：You mustn’t play with fire. 疑问句：Must + 主语 + 动词原形？ 肯定回答：Yes, ...must. 否定回答：No, ...needn’t / don’t have to. 情态动词 should（1） 核心含义：建议、责任 表建议：应该、应当 例句：You should exercise more. 表责任：应该做某事 例句：We should help others. 情态动词 should（2） 否定形式：shouldn’t 含义：不应该 例句：You shouldn’t stay up late. 疑问句：Should + 主语 + 动词原形？回答：Yes, ...should./No, ...shouldn’t. 易混点：mustn’t vs needn’t mustn’t：禁止，绝对不能做 needn’t：不必，没必要做 例句：You mustn’t run here. 例句：You needn’t finish it today. 二者含义完全不同，注意区分 四大情态动词用法总表 单词 核心用法 否定 can 能力、许可 can’t may 许可、可能 may not must 必须、推测 mustn’t should 建议、责任 shouldn’t 否定句变换规则 直接在情态动词后加 not can → can’t may → may not must → mustn’t should → shouldn’t 后面永远跟动词原形,，不用加 don’t / doesn’t 一般疑问句规则 直接把情态动词提到句首 结构：情态动词 + 主语 + 动词原形？ 句尾用问号，不用 do/does/did，回答用对应的情态动词 特殊疑问句规则 结构：疑问词 + 情态动词 + 主语 + 动词原形？ 常用疑问词：what / where / how / who 例句：What can you do? 例句：Where should I go? 基础填空练习 用 can / may / must / should 填空 1.We __________ keep quiet in library. 2.__________ I use your ruler? 3.He __________ play the guitar very well. 4.You __________ drink more water every day. must May can should 基础填空练习 5.It __________ rain this afternoon. 6.Students __________ be late for school. 7.__________ you help me? 8.We __________ protect our environment. may mustn’t Can should 单项选择 1.—__________ I go now? —Yes, you must. A. Can B. Must C. Should 2.You __________ talk in class. A. mustn’t B. needn’t C. may not 3.—Must I clean the room?—No, you __________. A. mustn’t B. needn’t C. can’t 4.She __________ speak French. A. can B. should C. must 5.You __________ eat too much junk food. A. can B. shouldn’t C. may 6.It __________ be his book. His name is on it. A. must B. may C. can B A B A B A 句子分类练习 ①能力 ②许可 ③建议 ④必须 ⑤禁止 1.I can run fast. → ______2.You should get up early. → ______ 3.May I come in? → ______4.We must finish homework. → ______ 5.You mustn’t fight. → ______6.He may come tomorrow. → ______ 7.They can draw pictures. → ______ ① ③ ② ④ ⑤ ② ① 否定句改写 1.I can play football.→ ________________________ 2.You should go there.→ ________________________ 3.We must talk loudly.→ ________________________ 4.She may watch TV.→ ________________________ 5.He can help you.→ ________________________ 6.They should eat too much.→ ________________________ I can’t play football. You shouldn’t go there. We mustn’t talk loudly. She may not watch TV. He can’t help you. They shouldn’t eat too much. 一般疑问句改写并回答 1.He can swim.→ ________________________ 2.We should study hard.→ ________________________ 3.They may go out.→ ________________________ 4.You must finish the work.→ ________________________ 5.I can help you.→ ________________________ Can he swim? Yes, he can. / No, he can’t. Should we study hard? Yes, we should. / No, we shouldn’t. May they go out? Yes, they may. / No, they can’t. Must you finish the work? Yes, I must. / No, you needn’t. Can you help me? Yes, I can. / No, I can’t. 特殊疑问句改写，对划线部分提问 1.I can sing English songs.→ ________________________ 2.You should help your parents.→ ________________________ 3.She can speak two languages.→ ________________________ 4.We must obey the school rules.→ ________________________ What can you do? What should you do? How many languages can she speak? What must you do? 课堂总结 1.情态动词 + 动词原形 2.四大核心词：can / may / must / should 3.否定直接加 not，疑问直接提前 4.mustn’t 禁止，needn’t 不必 5.结合语境选择正确情态动词 教学课件 Unit4 语法专项—— 情态动词 Thank you for listening! 21 $