人教必修三unit 語法情態(tài)動(dòng)詞PPT課件

1、1. Ought to 表應(yīng)該做的事：You ought to do it carefully. 表非?？赡艿氖拢篐e ought to be here by now.ought to 表應(yīng)該，語氣should第1頁/共35頁2. ought to 的否定句形式是oughtnt to , 一般疑問形式是將ought 置于主語前. eg: We ought not to start so late.3.在反意疑問句中常常省略to,用oughtnt 或是shouldnt.第2頁/共35頁You ought to have helped him with his English, _ ?A.wont

2、 you B. ought not youC. shouldnt you D. wouldnt you第3頁/共35頁 2. have to have to 表示客觀需要去做的事情，意為“必須，不得不?！?I have to get the station early to catch the first train. We missed the bus so we had to walk home. We have to overcome all kinds of difficulties.第4頁/共35頁 Have to 有多種時(shí)態(tài)。常見的有： 一般將來時(shí) We will have to

3、gather at the school gate at 7 tomorrow. 一般現(xiàn)在時(shí) I have to take more money with me because my girlfriend has so much to buy. 一般過去時(shí) Finally, we had to give up our idea to hold a picnic outside as it rained for a whole afternoon. have to （考點(diǎn)）第5頁/共35頁 must表主觀意志，而have to表由于客觀因素不得不做完成的事情。 Must沒有過去式，除在間接引語中

4、可表示過去的時(shí)間。在直接引語中表示過去的時(shí)間用had to代替。 I told her that she must give up smoking. She said, “We had to get everything ready that night.”比較must & have to第6頁/共35頁即學(xué)即用:用have to 完成句子.1.天色太晚了,我現(xiàn)在的得回家了.It is too late, so I _now.2.昨天我不得不離開.I _yesterday.第7頁/共35頁3.他們沒必要擔(dān)心核輻射.They _the nuclear radiation.4.我必須馬上做

5、嗎?-Must I do it at once ?-No,_.第8頁/共35頁選詞填空:must, mustnt ,have to 5.現(xiàn)在我不得不走了,因?yàn)槲覌寢屔×?I _go now, for my mother is ill.6.我一定要戒煙.I _stop smoking.7.晚上你一定不能獨(dú)自出去.You _go out alone at night .第9頁/共35頁1. Johnny, you _ play with the knife, you _ hurt yourself. A. wont ; cant B. mustnt ; may C. shouldnt ; mus

6、t D. cant ; shouldntB 第10頁/共35頁2. -May I pick a flower in the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No, you wontC 第11頁/共35頁Need I do ? Yes, you must. No, you neednt. 3. dare & need情態(tài)動(dòng)詞情態(tài)動(dòng)詞實(shí)義動(dòng)詞實(shí)義動(dòng)詞dare否，疑，條否，疑，條 dare not do否否,疑疑dont dare to do dont dare do不用于肯定句不用于肯定

7、句肯：肯：dare to do need否，疑否，疑 neednt do (dont) need sth (dont) need to do肯：肯：must, have to, ought to, should第12頁/共35頁注意對need問句的回答: -Need I finish the work today? -Yes, _. No, _. No, _.you mustyou needntyou dont have toneednt 對其它情態(tài)動(dòng)詞的回答:-Shall I tell John about it?-No, you _.-No, you _. -Must we do it n

8、ow? -No, you _.-No, you _.needntdont have toneedntdont have to第13頁/共35頁1.You _ return the book now. You can keep it till next week if you like.A.cant B. mustnt C. neednt D. may notC 2. Must I drive to his house and pick up the children? No, . A. you shouldnt B. you might not C. you neednt D. you mus

9、tntC 第14頁/共35頁情態(tài)動(dòng)詞+have done 的用法第15頁/共35頁1.Must +have done 表示對過去發(fā)生的事情作出的肯定判斷1).他們在玩籃球， 他們一定完成了作業(yè)。They are playing basketball, they must have finished their homework.2.路是濕的。昨天晚上一定下雨了。The road is wet. It must have rained last night.第16頁/共35頁2.can/could have done 在否定句對過去發(fā)生行為的可能性進(jìn)行推測.1.剛才我還看見他了， 所以他不可能出

10、國的。 I saw him just now so he couldnt have gone abroad.2. 門是鎖著的， 所以她不可能在家。 The door was locked. She couldnt have been at home.第17頁/共35頁lcould(不用can)+have done,在肯定句中表示“本來能夠而沒能”，具有婉轉(zhuǎn)的批評和責(zé)備之意,1. I could have passed my exam easily, but I made too many stupid mistakes. 我本來能夠輕易通過考試，但我犯了太多不該 犯的錯(cuò)誤。2.You coul

11、d have reported to me earlier. 你本該早點(diǎn)告訴我的。第18頁/共35頁3.might/may+have doneMay/might have done sth表示對過去的可能性推測“過去可能做了某事”其程度小于must have done sth。不用于疑問句。第19頁/共35頁She might have been hit by a car or motocycle.她可能是被一輛小氣車或摩托車撞了。The Jinsha Ruins may have been the political and cultural centre of the ancient Sh

12、u Kingdom.金沙遺址可能是古代蜀國的政治和文化中心。第20頁/共35頁l3.might+have done表示“本來可能”，但實(shí)際上沒有發(fā)生的事。另外，還可表示“本來應(yīng)該或可以做某事”之意，含有輕微的責(zé)備語氣。1.You might not have told her.你本可以不告訴他的。（事實(shí)上你告訴他了）2. You might have come earlier.你本可以早點(diǎn)來的。（但沒有這樣）第21頁/共35頁4.should/ought to have done表示責(zé)備或批評,意為“本應(yīng)該做到但沒有做到”,用于否定則表示“本不該但”ought to的語氣更強(qiáng)烈.You sho

13、uld/ought to have told her the truth earlier. She shouldnt have left without saying a word.第22頁/共35頁lneednt +have done表示做了本來不必去做的事。1.She neednt have gone to the station yesterday.昨天她本不必到火車站去的.（昨天她去了）2.You neednt have bought it.你本可不必買它的。 （你買了）第23頁/共35頁Individual activity第24頁/共35頁1. We didnt see Tom a

14、t the meeting yesterday. He it. A. mustnt have attended B. cannot have attended C. neednt have attended D. would have not attendedB 第25頁/共35頁2.-There were already five people in the car, but they managed to take me as well. -It _a comfortable journey A. cant be B. shouldnt be C. mustnt have been D.

15、couldnt have been D 第26頁/共35頁3Where is my pen? I _it. A. might lose B. would have lost C. should have lost D. must have lost4. I didnt hear the phone. I _asleep A. must be B. must have been C. should be D. should have beenD B 第27頁/共35頁5. - Guess what! I have got A for my term paper. - Great! You _ r

16、ead widely and put a lot of work into it.A.must B. should C. must have D. should have6. The teacher _have thought Johnson was worth it or she wouldnt have wasted time on him, I suppose. A. should B. can C. would D. must CD第28頁/共35頁7.She _ have left school, for her bike is still here。A. cant B. would

17、nt C. shouldnt D. needntA8.Thank you for all your hard work last week. I dont think we _ it without you。A. can manage B. could have managed C. could manage D. can have managedB第29頁/共35頁9.What a pity. Considering his ability and experience, he _ better。A. need have done B. must have done C. can have done D. might have doneD第30頁/共35頁10. I cant find my purse anywhere。- You _ have lost it while shopping。A. may B. can C. should D. wouldA11.- My cats really fat. - You _ have given her so much food. 2007 浙江卷 A. wouldnt B. cou