語(yǔ)法：情態(tài)動(dòng)詞must和have-to.練習(xí)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上精選優(yōu)質(zhì)文檔-傾情為你奉上專心-專注-專業(yè)專心-專注-專業(yè)精選優(yōu)質(zhì)文檔-傾情為你奉上專心-專注-專業(yè)語(yǔ)法：情態(tài)動(dòng)詞must、have to 和have got to情態(tài)動(dòng)詞must和have to都有“必須”的含義，它們的用法如下：（一）、 must “必須”、“應(yīng)該”的用法:1.must 表示“必須”、“應(yīng)該”。例如：We must protect our environment.(我們必須保護(hù)環(huán)境。）Everyone must obey the rule.（人人必須遵守制度。）2. must的否定形式must not表示“不應(yīng)該”、“禁止”、“不準(zhǔn)”。語(yǔ)氣比較強(qiáng)烈

2、。例如：You mustnt speak like that.(你不應(yīng)該像那樣講話。）You mustnt be late for school.（你不應(yīng)該上學(xué)遲到。）3.在回答must的問(wèn)句時(shí)，肯定形式用must來(lái)回答，但否定形式用neednt 或dont have to來(lái)回答。而不用mustnt來(lái)回答。例如：Must I be home before 8 oclock?(8點(diǎn)之前我必須回家嗎？) Yes, you must. No, you neednt./No, you dont have to. （是，你必須。） （不，你不必。）4.must還可表示推測(cè)，意思是“一定”、“必定”，一般

3、只用于肯定句中。分三種情況：1.）對(duì)于現(xiàn)在狀態(tài)的推測(cè)，我們用：must +v.（狀態(tài)動(dòng)詞或系動(dòng)詞），例如：He must be at home.(他準(zhǔn)在家里。）There must be some children in the room.（房間里準(zhǔn)有些孩子。）2.）對(duì)于現(xiàn)在動(dòng)作的推測(cè)，我們用：must +be + doing（行為動(dòng)詞），例如：They must be cleaning their room.(他們準(zhǔn)是在打掃房間。）He must be watching TV.（他準(zhǔn)是在看電視。）3.）對(duì)于過(guò)去事實(shí)的推測(cè)，我們用：must +have +過(guò)去分詞，例如:It must hav

4、e rained last night.(昨晚準(zhǔn)是下雨了。）I didnt hear the phone. I must have been asleep.（我沒(méi)有聽(tīng)到電話，我準(zhǔn)是睡著了。）（二）、have to 表示“必須”、“不得不”，例如：He has to stay in bed for 3 or 4 days.(他必須臥床休息三四天。）We will have to get up early tomorrow.（明天我們必須早起。）（三）、have got to是 have to的口語(yǔ)形式。例如： Ive got to leave for Nanjing.(我不得不去南京。)*Mus

5、t與 have to的區(qū)別： must表示的是說(shuō)話人的主觀看法，而have to則表示的是客觀需要。Must一般只有現(xiàn)在時(shí)，而have to有更多的形式。I must go now.(主觀看法) My mother is ill, so I have to go now.(客觀需要)*Have to與 have got to的區(qū)別： have got to雖然是have to的口語(yǔ)形式，但二者在用法上有嚴(yán)格的區(qū)別： have to的前面還可以用情態(tài)動(dòng)詞或助動(dòng)詞，而have got to卻不可以； have to的否定形式為dont/doesnt /didnt +have to,疑問(wèn)式為Do/D

6、oes/Did + 主語(yǔ) + have to?而 have got to的否定形式是在have后加 not,疑問(wèn)式把have提前。例如： We dont have to go home. Do you have to go home? We havent got to go home. Have you got to go home?練習(xí)：一、.Fill in the blanks using have to, have got to, must, should, ought to, had better.1.You _ not get down until the bus has stopp

7、ed.2.They _ be encouraged to speak English after class.3.You often _ wait a long time for a bus.4.We _ go and see Mary tomorrow, but I dont think we will.5.I _ not miss my train.6.When traveling, you _ take care of your health.7.In some parts of the world, you _ boil the water before drinking it.8.I

8、f you have a stomach pain, you _ drink hot weak tea.9.You _ not swim immediately after a heave meal.10.You _ not wake me up when you come in.11.He _ be ill, for he looks so pale.12.You _ not have given him the money.13.Its getting late. I am afraid I _ go.二、Choose the best answer.1.-Must I do it now

9、?-No, you _. A. neednt B. dont have to C. mustnt D. A or B2.Its nearly seven oclock. Jack _be here at any time. A. must B. need C should D can.3.-When can I come for these photos? I need them tomorrow afternoon.-They _be ready by 12:00. A. can B. should C. might D. need4.Sorry, Im late. I _ have tur

10、ned off the alarm oclock and gone back to sleep again. A. might B. should C. can D. will5.I told Sally how to get there, but perhaps I _ for her. A. had to write it out B. must have written it out C. should have written it out D. ought to write it out6.Jenny _ have kept her word. I wonder why she ch

11、anged her mind. A. must B. should C. need D. would7.Tom ought not to _ me your secret, but he meant no harm. A. have told B. tell C. be telling D. having told8.Sir, you _ be sitting in the waiting room. It is for women and children only. A. oughtnt to B. cant be C. wont D. neednt9.If you really want

12、 yourself to be in good health, you must _always _ so much. A. not, be smoking B. not, have smoked C. not, to smoke D. be not, smoking10.I didnt hear the phone, I _ asleep. A. must be B. must have been C. should be D. should have been11.I was really anxious about you. You _ home without a word. A. m

13、ustnt leave B. shouldnt have left C. couldnt have left D. neednt leave12.Youd better go at once, _ you?A. shouldnt B. wouldnt C. hadnt D. couldnt13.She ought to be praised, _? A. ought she B. she ought C. oughtnt she D. she oughtnt14.He _ go there by train. A. oughtnt to B. oughtnt C. ought to not D. didnt ought to15.-Look, it_ be Mr. Wang. -No, it _ be him. He has gone abroad. A. may; mustnt B. must; may not C. must; cant D. can; may not三、Correct the mistake in each