情态动词用法课件2024年中考英语二轮复习

情态动词用法 QXF 情态动词有一定的词义，但它不能单独做谓语，它后面必须跟动词原形。情态动词没有人称和数的变化。 情态动词 情态动词 + V原形 情态动词 could can might may have to must would will ought to should need had better 3 can / could 1 can 表示能力、允许、可能性、怀疑猜测，意为“能，会，可以” can't 意为“不会，不能，不可以”，还有“不可能”之意 It can't be Mary because she is not at home. Man can not live without air. Learning English can be difficult. Can I use your bike? could could为can的过去式，用法与can类似，常用于过去时中 could还可用于现在时中表示委婉客气，相当于can; 在疑问句中，用could可表示请求，语气较委婉。 He asks if he could smoke here. — Could I have the television on? — Yes, you can/may. / No, you can't. /I am afraid not. 5 Attention: can/be able to区别: Edison always wondered why hens could hatch (孵) chickens while he was not able to. Question: Are the two modal verbs interchangeable (互换) ? If not, why? can表示与生俱来的能力或一种客观可能，而be able to更加强调通过后天的学习和努力获得的能力，或者在某个客观的场合和背景下，能做到的事情。 Attention: can/be able to区别: A big fire broke out in ABC hotel yesterday. Luckily, everyone __________ run out of the building. was able to 2. She _____ speak both English and French. can 2 may / might may 表示允许、也许，意为“可以，也许，可能” 一般疑问句的回答 肯定回答：Yes, please./Certainly./ Sure等 Yes, 主语+can. 否定回答：Please don't. No，you can't/mustn't. 用于祈使句中表示祝愿 祝你成功！ May you succeed. 表示推测、可能（只用于肯定句，疑问句则要用can或could） May you be happy all your life. might是may的过去式，与may用法类似，常用于过去时中； 用在疑问句中，还可表示委婉客气。might比may的语气更委婉一些 might ---- May/Might I take this book out of the room? ---- Yes, you can. (No, you can't / mustn't. ) 9 3 must / have to must: 意为“必须，应该(提出建议)”,表示必须要做的事 一般疑问句的回答 肯定回答：Yes, 主语+must. 否定回答：No, you needn't. No, you don't have to. mustn't 意为“不可以，不能”，表禁止，不许可。 must还可表示有把握的推测，意为“一定、肯定”。 He must be doing his homework now. — Must we hand in our exercises today? — Yes, you must. — No, you needn't./ No, you don't have to. 11 must/have to: 必须，不得不 must 表示说话人主观上的看法，既主观上的必要 have to 表示客观的需要 有人称、数、时态的变化 He had to look after his sister yesterday. My brother was very ill, so I had to call the doctor in the middle of the night