modalverbs情态动词.ppt

Common Modal Verbs:常见的情态动词： Can Could 能够 May Might 或许 Must 必须 Ought to 应该 Shall Should 应该 Will Would 会 Modal verbs are special verbs which behave very differently from normal verbs. 情态动词是特殊的动词，它们和其他单词很不一样！ 1. Modal verbs do not take “-s” in the third person. 第三人称后不需要加“-s”。 e.g. He can? speak Chinese. 2. 否定句 直接在情态动词后加 “not”. e.g. They may not come to the party. 3. Many modal verbs cannot be used in the past tenses or the future tenses. 许多情态动词不能用于过去时或者将来时。 e.g. She musted study very hard. Can (be able to) “Can” 是最常用的一个情态动词。它能用来表示 能力、许可和可能性。 e.g. I can ride a horse. Can I use your pen? You cannot spell. Can的过去时 ? could /kud/ Using “can” in present and past Ask and answer “may” 常被用来表达可能性，也可以表示请求。 表示请求： May I use your bathroom? 表示可能性 ：I may go shopping in the afternoon. may的过去时 ? might He might be our new teacher. PS：might也可以表示推测，可能性比may小,语气更婉转。 Using “may” in present, future and past “Must” 用来表示确定的意思，表示必须，一定 。 必须： You must buy a ticket. 一定 ： He must be our new teacher. must not 表示禁止 You must not park here. What do the signs mean? Do you know? Do exercise about modal verbs 1 John____ come to see us tonight, but he isn’t very sure yet.  A. may B. can C. has to D. must 2 They _____ do well in the exam.  A. can be able to B. be able to C. can able to D. are able to -May I take this book out? -No, you_______.  A. can’t B. may not C. needn’t D. aren’t 4 You_____ go and see a doctor at once because you’ve got a fever. A. can B. must C. dare D. would 5 -Can you speak Japanese? -No, I_______. A. mustn’t B. can’t C. needn’t D. may not 6 Must I finish the work today? No, you __. A. don’t B. won’t C. needn’t