人教版英語必修三Unit2-Grammar課件

1、Grammar Modal verbs 1. ought to表職責(zé)和義務(wù)，說話人認(rèn)為“應(yīng)該”否定形式：ought not to/oughtnt to 疑問句形式： 只把ought 提前e.g. 下次過馬路時(shí)你應(yīng)該更加小心。You ought to be more careful when you cross the road next time. 你不應(yīng)該再犯這種錯(cuò)誤了。You ought not to make this kind of mistake again.-Ought I to finish the task before ten oclock?- Yes, you ought

2、to.慢慢地進(jìn)食，有助消化。 You ought to eat slowly and its good for digestion. You ought to hand in the homework on time.1. What time ought I _? Aarrived Barriving Carrive Dto arrive2. He _ speak to his mother like that. Aought not to Bdoesnt ought to Cnot ought to Dought to notb. 表推測(cè)，多指按常理的一種推測(cè)，“按理應(yīng)該”e.g. Acco

3、rding to the policy the price ought to go down soon.要是他六點(diǎn)就出發(fā)的話，這會(huì)兒該到這里了.If he started at six, he ought to be here now. c. 多數(shù)情況下，ought to 可與should互換使用。ought to的反意疑問句用shouldnt替代。You ought to have helped him with his English, _ ?A. wont you B. ought not youC. shouldnt you D. wouldnt you 2. must和have to

4、 must的用法 1）表示主觀的義務(wù)和必要,主要用于肯定句和疑問句,意思為“必須，得，要”；由must 引起的疑問句，肯定回答要用must或haveto,否定回答要用neednt或donthaveto, 意思是“不必” ； MustIfinishthetaskrightnow? 我現(xiàn)在必須完成這個(gè)工作嗎？ Yes,youmust./Yes,youhaveto. 是的。 (No, you neednt. / No, you dont have to. 不，不必。) must的否定形式mustnt表示禁止，意思是“不能，不許”。如：You mustnt come here without perm

5、ission. 未經(jīng)允許，你不能來這兒。 haveto的用法 1）must表示一種主觀的需要，而haveto表示一種客觀的需要，意思是“不得不”。如： I have to attend an important meeting this afternoon. 今天下午我不得不參加一個(gè)重要的會(huì)議。 Mother is out, so I have to look after the shop.媽媽不在家，因此我不得不照看商店。 2）haveto的否定形式是dont have to, 相當(dāng)于neednt。如： They dont have to buy a computer at present.

6、 他們目前沒有必要買電腦?！究祭縏he boss has given everyone a special holiday, so we _ go to work tomorrow. A. cant B. mustntC. neednt D. shouldnt【點(diǎn)撥】考查情態(tài)動(dòng)詞。根據(jù)題意, 可知這里表示“沒有必要”, 故只能選C項(xiàng)?！究祭縒hat do you think we can do for our aged parents?You_ do anything except to be with them and be yourself. A. dont have to B. ou

7、ghtnt toC. mustnt D. cant 【點(diǎn)撥】根據(jù)題意“除了和他們呆在一起做你自己外, 沒有必要做任何事情。”可知這里選擇dont have to表示“不必”。故選A項(xiàng)。3. needneednt +have done表示做了本來不必去做的事。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）You neednt have bought it.你本可不必買它的。 （你買了）4. dare作情態(tài)動(dòng)詞多用于疑問句、否定句、條件狀語從句及表示懷疑的名詞性從句。 表“敢”e.g. 夜間我不敢在小樹林里自己走

8、。 I dare not walk alone through the wood at night. 你怎么敢做這樣的事情。 How dare you do such kind of thing?If you dare speak to me like that again, youll be sorry.如果你在敢跟我那樣說話，你會(huì)后悔的。need / dare 作實(shí)義動(dòng)詞用，常用在肯定句中, 有人稱、時(shí)態(tài)、和數(shù)的變化He needs to go there himself.He has grown up,we dont need to worry about him.Sth (sb) ne

9、ed( want, request)+ doing/ to be done The house needs cleaning/ to be cleaned. The boy needs sending to the hospital at once.I wonder how he_that to the teacher. A. dare to say B. dare saying C.not dare say D.dared sayAs it turned out to be a small house party, we _ so formally.A neednt dress B. did

10、nt have to dress upC. Might not have dressed up D. neednt have dressed upD1. I thought you _like something to read, so I have brought you some books. A. may B. might C. would D. must 2. Where is my pen? I _it. A. might lose B. would have lost C. should have lost D. must have lostII. 高考鏈接3. I didnt h

11、ear the phone. I _asleep. A. must be B. must have been C. should be D. should have been4. -Is John coming by train? -He should, but he _ not. He likes driving his car. A. must B. can C. need D. may5.It has been announced that candidates (候選人) _ remain in their seats until all the papers have been collected. (2002上海高考題） A. can B. will C. may D. shall6. -I heard they went skiing in the mountains last winter. -It _ true because there was little snow there. A. may not be B. wont be C. couldnt be D. mustnt be7. -There were already five people in the car, but they managed to take me as well.