need-must用法及练习

1、精品文档need 用法一用作实义动词1. need sth.这是need最常见的用法之一，其后的宾语可以是名词，也可以是代词。如：1) . The soup n eeds salt.2) . They donneed afraid any more.3) . Does he n eed any help?2.need doing与need to be done通常物做主语，need后面可跟动名词作宾语，这种情况下应注意两点：1.主动形式的动名词doing具有被动的含义；2.该动名词可以改为其动词不定式的被动形式而句子的意义不变。例如：4) . The door n eeds painting.

2、=The 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.作为实义动词，need后面需要接带to的动词不定式，表示有义务或责任去做某事。如：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. 用作情态动词1.没有人称和数的变

3、化。不论主语是第几人称，不论主语是单数还是复数，情态都词都无形式变化；2.不能单独充当谓语。情态动词必须与一个实义动词一起构成复合谓语，并且这个实意动词要始终是 动词原形。3.变为否定句时只需在情态动词之后加n ot。9).You neednt do it again10).He neednt worry about it.4.变为疑问句时只需将情态动词提到主语的前面。例如：11) . Need I type this letter aga in?12)Need I stay here any Ion ger?No, you neednYes, you must.三. 用作名词need作为名词

4、，含义为 缺乏，需要”其复数表示基本需要”要掌握两个词组：in (great) need of(急需) 与meet the needs of(满足.的需要)。例如：13) . Thereno need for you to try again.14) . The factory is in great n eed of fun ds.need+have+done表示本来需要做某事而没有做。neednt+have+done则表示 本来不需要做某事而做了”I n eed nt have bought so much wineonly five people came.He n eed have h

5、urried to the stati on. In that case, be would nt have missed the train.you n eed not have saidthatshould+have+done意思是 本来应该做某事，而实际没做。”shouldnt+have+done表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。1. Tom, you are too lazy. The work should have been finished yesterday.2. Look, Tom is cryin g. I should nt have bee n

6、 so harsh on him.3 you should have told memust+have+done表示对过去事情的肯定推测，译成一定做过某事，该结构只用于肯定句。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.1欢迎下载must 的用法1. must表示 必须” 应该”例如：1We must protect our en vir onment.2Every one must obey the rule.2.

7、must的否定形式must not表示 不应该” 禁止” 不准”语气比较强烈。例如：1You must nspeak like that.2You must nbe late for school.3.在回答must的问句时，肯定形式用must来回答，但否定形式用need nt或donhave to而不用must nt来回答。例如：-Must I be home before 8 oclock?（8点之前我必须回家吗？）-Yes, you must.No, you n eed n./No, you donhave to.（是，你必须。）（不，你不必。）4. must还可表示推测，意思是 一定”

8、 必定” 一般只用于肯定句中。分三种情况：1.）对于现在状态的推测，我们用：must +v.（状态动词或系动词），例如：1He must be at home.（他准在家里。）2There must be some children in the room.（房间里准有些孩子。）2.）对于现在动作的推测，我们用：must +be + doing（行为动词），例如：1They must be cleaning their room.（他们准是在打扫房间。）2He must be watching TV.（他准是在看电视。）3.）对于过去事实的推测，我们用：must +have +过去分词，例如：

9、1It must have rained last night.（昨晚准是下雨了。）2I didnhear the phone. I must have been asleep.（我没有听至U电话，我准是睡着了。练习一.Choose the right answer.()1. You _ any help, do you?A. don tneedB. neednC. need()2. -Must I stay at the office this afternoon?A. donB. neednC. donneed()3. Tomget up a little earlier tomorrow

10、.A. n eeds B. n eedC. n eed toD. n eeds to()4. Need the doctor_ with you tonight?A. stayi ngB. stayC. staysD. to stay()5. Look! Your shirt is so dirty. It.B. n eed to washC. n eeds wash ingD. n eed washthe dema nd.B. meet the n eed of()8. Your room is full of dust. It()9.Davidanything to drink?精品文档来

11、回答。D. doesnneed-No, youD. canA. n eed washi ng()6. The supply canA. meet n eed ofC. meet the n eeds ofD. meet n eeds of().7. The hospital isA. in great n eed ofC. in great n eed withblood.B. on great n eed ofD. on great n eed withA. n eed clea nC. n eed to be clea nedB. n eed clea ningD. n eeds to b

12、e clea nedA. Need,B. Needs,C. DoesneedD. Doneed()10. Youto the meeting tomorrow if you have something important to do.A. needn tto comeB. donneed come2欢迎下载精品文档C. donneed comingD. needncome二.Fill in the blanks using have to, have got to, must, should, ought to, had better.1. You_ not get dow n un til

13、 the bus has stopped.2. They_ be en couraged to speak En glish after class.3. You ofte n_wait a long time for a bus.4. We_go and see Mary tomorrow, but I dontthi nk we will.5.1_ not miss my trai n.6.Whe n traveli ng, you_take care of your health.7.ln some parts of the world, you_boil the water before drinking it.8.If 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 whe n you come in.三.Tran slate1.他需要好好睡上一晚上。2.你需要理发了。3.我需要你查一下英语字典。4.你不必解释。5.我想要知道我们是否要