完整版needmust用法及練習(xí)

1、need用法一 用作實(shí)義動(dòng)詞1 need sth.這是need最常見的用法之一，其后的賓語可以是名詞，也可以是代詞。如：1) . The soup n eed salt.2) . They don nbed afraid any more.3) . Does he n eed any help?2 need doing 與 need to be done通常物做主語，need后面可跟動(dòng)名詞作賓語，這種情況下應(yīng)注意兩點(diǎn)： 主動(dòng)形式的動(dòng)名詞doing具有被動(dòng)的含義； 該動(dòng)名詞可以改為其動(dòng)詞不定式的被動(dòng)形式而句子的意義不變。例如：4) . The door n eeds painting.=The

2、door n eeds to be pain ted.5) . Your car n eeds repairi ng.=Your car n eeds to be repaired.3. need to do sth 作為實(shí)義動(dòng)詞，need后面需要接帶to的動(dòng)詞不定式，表示有義務(wù)或責(zé)任去做某事。女口：6) . What do we n eed to take for the party?7) . Will we n eed to show our ID card?8) . I n eed to take good care of my sister.二. 用作情態(tài)動(dòng)詞 沒有人稱和數(shù)的變化。不論

3、主語是第幾人稱，不論主語是單數(shù)還是復(fù)數(shù)，情態(tài)都詞都無形式變化； 不能單獨(dú)充當(dāng)謂語。情態(tài)動(dòng)詞必須與一個(gè)實(shí)義動(dòng)詞一起構(gòu)成復(fù)合謂語，并且這個(gè)實(shí)意動(dòng)詞要始終是動(dòng)詞 原形。 變?yōu)榉穸ň鋾r(shí)只需在情態(tài)動(dòng)詞之后加n oto9) You neednt do it again 10) . He neednt worry about it. 變?yōu)橐蓡柧鋾r(shí)只需將情態(tài)動(dòng)詞提到主語的前面。例如：11) . Need I type this letter aga in?12) 一 Need I stay here any Ion ger?No, you needn t.Yes, you must.三. 用作名詞need作為

4、名詞，含義為 缺乏，需要”其復(fù)數(shù)表示 基本需要”要掌握兩個(gè)詞組:in (great) need of (急 需) 與meet the needs o滿足 的需要)。例如：13) . There s no need for you to try again.14) . The factory is in great n eed of fun ds.need+have+done 表示本來需要做某事而沒有做。neednt+have+done 則表示本來不需要做某事而做了I n eed rTt have bought so much wine only five people cameHe n eed

5、 have hurried to the stati on. In that case, be would nt have missed the train.you n eed not have said thatshould+have+done ”意思是本來應(yīng)該做某事，而實(shí)際沒做?！?shouldnt+have+done 表示本來不應(yīng)該做某事，而實(shí)際做了。含有指責(zé)對(duì) 方或自責(zé)的含意。1 Tom, you are too lazy. The work should have been finished yesterday.2. Look, Tom is cry in g. I should n

6、t have bee n so harsh on him 3 you should have told memust+have+done “表示對(duì)過去事情的肯定推測(cè)，譯成一定做過某事”，該結(jié)構(gòu)只用于肯定句。1 It must have rained last ni ght, for the grou nd is wet.2 You must have bee n mad to speak to the serva nt.must的用法1. must表示必須”應(yīng)該”例如: We must protect our en vir onment. Every one must obey the rul

7、e.2. must的否定形式must not表示 不應(yīng)該”禁止”不準(zhǔn)”語氣比較強(qiáng)烈。例如： You mustn t speak like that. You mustn t be late for school.3. 在回答must的問句時(shí)，肯定形式用must來回答，但否定形式用needn,或don t have t來回答。而不 用mustn來回答。例如：Must丨be home before 8 o clo點(diǎn)？之前我必須回家嗎？)一 Yes, you must.No, you needn t./No, you don t have to.（是，你必須。）（不，你不必。）4. must還可表示

8、推測(cè)，意思是一定”必定” 一般只用于肯定句中。分三種情況：1. ）對(duì)于現(xiàn)在狀態(tài)的推測(cè)，我們用：must 4-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)于過去事實(shí)的推測(cè)，我們用：must +hav

9、e +過去分詞，例如： It must have rained last night昨晚準(zhǔn)是下雨了。） I didn t hear the phonmiJst have been asleep.（我沒有聽到電話，我準(zhǔn)是睡著了。）練習(xí)一. Choose the right answer.()1. You any help, do you?A. don * t need B. needn *t C. needD. doesn t need()2.-Must I stay at the office this afternoo n?-No, youA. don !t B. needn *t C. d

10、on t need D. cant ()3. Tom get up a little earlier tomorrow.D. n eeds toA. n eeds B. n eed C. n eed to()4. Need the doctorwith you toni ght?A. stayi ng B. stayC. stays D. to stay()5. Look! Your shirt is so dirty. It.B.n eed to wash C. n eeds wash ing D. n eed wash the dema nd. B.meet the n eed ofD.

11、meet n eeds ofblood.A. n eed wash ing()6. The supply canC. mAetrbleetmeeEtt of ().7. The hospital isB. on great n eed ofA. in great n eed ofC. in great n eed with()9. DavidA. Need,an yth ing to drink?B. Needs,C. Does -need D. Doneed()8. Your room is full of dust. It A. n eed clea nC. n eed to be cle

12、aB. n eed clea ning D. n eeds to be clea()10. You to the meeti ng tomorrow if you have someth ing imports nt to do.A. needn t to comeB. don t need comeC. don t need comi ngD. n eed n t come二. Fill in the blanks using have to, have got to, must, should, ought to, had better.1. Younot get dow n un til

13、 the bus has stopped.2. Theybe en couraged to speak En glish after class.3. You ofte n wait a long time for a bus.4. Wego and see Mary tomorrow, but I do thi nk we will.5.1not miss my trai n.6.Whe n traveli ng, youtake care of your health.7n some parts of the world, youboil the water before drin king it.8f you have a stomach pain, youdrink hot weak tea.9. Younot swim immediately after a heave meal.10. Younot wake me up whe n you come in.三. Tran