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1、情態(tài)動(dòng)詞后面 + 動(dòng)詞原形情態(tài)動(dòng)詞沒(méi)有人稱和數(shù)的變化I can not play basketball. I need buy / bought a computer. ( (能能) )( (需要需要) )She can / cans ride a horse. Amy need / needs buy a book.否定式構(gòu)成是在情態(tài)動(dòng)詞后面加 not I can play / played basketball. 第1頁(yè)/共14頁(yè)( (能能) )用法: 表示能力 :He can speak a little English. Can you fly? 表示請(qǐng)求或允許 : Can I hel

2、p you? 表示猜測(cè) :That can not be our English teacher, because she has gone to Shanghai . could也可表示請(qǐng)求，語(yǔ)氣委婉，主要用于疑問(wèn)句， 不可用于肯定句，答語(yǔ)應(yīng)用canCould I come to see you tomorrow? Yes, you can. （否定答語(yǔ)可用No, Im afraid not.） 第2頁(yè)/共14頁(yè)用法:表示請(qǐng)求或允許 :May I go home，please? (1)以may（表許可或請(qǐng)求）開(kāi)頭的一般疑問(wèn)句,肯定回答用may，否定回答用mustnt或cant. (2)在疑問(wèn)

3、句中不用于第二人稱 表示可能性 :You may be right. No, you _ ( (可以可以) )Yes, you may.might為may的過(guò)去式，但也可以代替may，語(yǔ)氣較為婉轉(zhuǎn)客氣或更加不肯定。 You might be right. mustnt / you cant.第3頁(yè)/共14頁(yè)試比較 : You may not smoke here(不可以) 語(yǔ)氣輕 You cant smoke here（不能）重 You mustnt smoke here（決不可）最重 第4頁(yè)/共14頁(yè)用法:既可以做情態(tài)動(dòng)詞, 也可以做實(shí)意動(dòng)詞 實(shí)意動(dòng)詞 (need to do sth) :

4、情態(tài)動(dòng)詞 (need do sth) : I need buy a big house. ( (需要需要) )He need drive me home. Do I need to buy a big house ? He needs to buy a big house. Need I buy a big house ? - Yes, you must.- No, you neednt / dont have to. (不必要)- Yes, you do.- No, you dont. 第5頁(yè)/共14頁(yè)用法: 表示推測(cè)“肯定，一定” : 表示義務(wù)、必要或命令 : You must come

5、early tomorrow -Must I finish my homework first? They must be at home. The light is on. - Yes, you must. - No, you dont have to/ neednt. ( (必須必須) )must開(kāi)頭的疑問(wèn)句，其否定回答通常用 dont have to 或neednt 。而不用mustnt ( (禁止禁止) ) 否定時(shí)表示 “禁止” :You mustnt smoke here. 第6頁(yè)/共14頁(yè)用法:Its eleven oclock . I have to go now .It was

6、 getting dark. He had to finish the work first . I dont have to go now . He doesnt have to finish the work first.( (必須必須) )have to 表示客觀因素We are very glad at the party , but its 11 , so we have to leave now .must 表示主觀因素We must study hard to find a good job for ourselves .( (必須必須) )第7頁(yè)/共14頁(yè)My brother

7、was very ill, so I call the doctor in the middle of the night. He said that they work hard. You dont have to tell him about it. You mustnt tell him about it. 你不一定要把此事告訴他。 你一定不要把這件事告訴他 .had tomust第8頁(yè)/共14頁(yè)Can I ?Yes, you can. No, you cant.May I ?Yes, you may. No, you cant / mustnt.Need I ?Yes, you mus

8、t. No, you neednt.Do I need to ?Yes, you do. No, you dont.Must I ?Yes, you must. No, you neednt.第9頁(yè)/共14頁(yè)第10頁(yè)/共14頁(yè)1. Must we clean the house now? No, you_. A.neednt B. may not C. mustnt D. cant2. You return the book now. You can keep it next week if you like. A. cant B. mustnt C. neednt D. may not3.

9、Johnny, you play with the knife, you hurt yourself. A. wont.cant B. mustnt.may C. shouldnt, must D. cant.shouldnt4. _I go back before lunch? No, I dont think you_. A. Need.must B. Do.need to C. Must.have to D. May . ought to第11頁(yè)/共14頁(yè)5. The teacher_ do all the exercises, but a pupil_. A. neednt.must

10、B. may not.must C. neednt.neednt D. cant.must6. Must I finish this novel this morning ? No, you_. A. mustnt B. might not C. dont have to D. cant7. The taxi _ only hold six passengers. It is full. You _ take the next one. A. may.may B. can.may C. may.can D. must.can8. This pen looks like mine, yet it isnt. Whose _ it be? A. must B. can C. may D. might第12頁(yè)/共14頁(yè)第13頁(yè)/共14頁(yè)感謝您的觀看。第14頁(yè)/共14頁(yè)