needmust用法及练习

1、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 need s salt.2) . They don ' t need afraid any more.3) . Does he need any help2. 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 needs pa

2、inting.=The door needs to be painted.5) . Your car needs repairing.=Your car needs 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 need to take for the party7) . W川 we need to show our ID card8) . I need to take good care of my sister.二.用作情态动词.没有人称和数的变化。不论主语

3、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；.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。.变为否定句时只需在情态动词之后加not。9) . You needn't do it again .10) . He needn't worry about it .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 again12) Need I stay here any longer No, you needn ' t. Yes, you must.三

4、.用作名词need作为名词，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) needof (急需) 与meet the needs of( 满足的需要)。例如：13) . There ' s no need for you to try again.14) . The factory is in great need of funds. "need+have+done表示本来需要做某事而没有做。"needn't+have+done " 则表示"本来不需要做某事而做了”。I needn't hav

5、e bought so much wineonly five people came.He need have hurried to the station. In that case, be wouldn't have missed the train.you need not have saidthat"should+have+done"意思是" 本来应该做某事，而实际没做 。""shouldn't+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

6、 too lazy. The work should have been finished yesterday.2. Look, Tom is crying. I shouldn't have been so harsh on him.3. you should have told me “must+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 night, for the ground is wet.2. You must have been mad to speak to t

7、he servant.must的用法表示“必须”、“应该”。例如： We must protect our environment. Everyone must obey the rule.2 . 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：You mustn' t speak like that. You mustn' t be 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needn' t或don' t have to来回答。 而不用mustn' t来

8、回答。例如：Must I be home before 8 o ' clock（8 点之前我必须回家吗）Yes, you must. No, you needn ' t./No, you don ' t have to.（是，你必须。）（不，你不必。）还可表示推测，意思是“一定”、“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：He must be at home.（ 他准在家里。）There must be some children in the room.（房间里准有些孩子。）2 .）对于

9、现在动作的推测，我们用： must +be + doing（行为动词），例如：They must be cleaning their room.（ 他们准是在打扫房间。）He 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：It must have rained last night.（昨晚准是下雨了。）I didn ' t hear the phone. I must have been asleep.（我没有听至U电话，我准是睡着了。）一.Choose the right answer.（）1

10、. You any help, do you ?A. don ' t need B. needn ' t C. need D. doesn ' t need（）2. -Must I stay at the office this afternoon -No, you .A. don ' t B. needn ' t C. don ' t need D. can ' t（）3. Tom get up a little earlier tomorrow.A. needs B. need C. need to D. needs to（）4. N

11、eed the doctor with you tonight?A. staying B. stay C. stays D. to stay（）5. Look! Your shirt is so dirty. It .A. need washing B. need to wash C. needs washing D. need wash（）6. The supply can ' t the demand.A. meet need of B. meet the need ofC. meet the needs of D. meet needs of（）.7. The hospital

12、is blood.A. in great need of B. on great need ofC. in great need with D. on great need with（）8. Your room is full of dust. It .A. need clean B. need cleaningC. need to be cleaned D. needs to be cleaned（）9. David anything to drink ?A. Need, - A B. Needs,、C. Does - need D. Do need（）10. You to the meet

13、ing tomorrow if you have something important to do.A. needn ' t to come B. don ' t need comeC. don t need coming D. needn t come二.Fill in the blanks using have to, have got to, must, should, ought to, had better. not get down until the bus has stopped.be encouraged to speak English after cla

14、ss.often wait a long time for a bus.go and see Mary tomorrow, but I don ' t think we will.not miss my ing, you take care of your health.some parts of the world, you boil the water before drinking it.you have a stomach pain, you drink hot weak tea.not swim immediately after a heave meal.not wake me up when you come in.