vii. need

1. 用作情态动词：

1）need后接动词原形。

I don't think you need take it too seriously.

我认为你没有必要太认真。

2）need没有人称和数的变化。

—Need we do it all alone at once？

—No, we needn't .

——我们需要马上独自做此事吗？

——不，不必了。

3）need多用在疑问句和否定句中。

—Need you go yet？

—Yes, I must .

——你需要走吗？

——是的，我得走了。

Need they have done that yesterday?

昨天他们有必要做那件事吗？

I asked him whether he need go.

我问他是否需要走。

4）needn't have done表示过去没有必要做某事而实际上已经做了。

You needn't have told me that, for I knew it earlier than you.

你真没有必要告诉我那件事，因为我比你知道得都早。

You needn't have gone to school yesterday, for it was Sunday.

昨天你没有必要去上学，因为是星期天。

We have plenty of bread, so I needn't have bought so much.

我们有足够的面包，因此我真没有必要买了这么多。

5）need疑问句, 其回答与must疑问句的回答一样。

—Need/Must I hand in my homework right now?

—No. you needn't .

——我现在必须上交作业吗？

——不，不必了。

2. need作实意动词：

1）后可接名词或代词。

We are certain to need help .

我们当然需要帮助。

In winter all of us need warm clothes .

在冬天我们所有人都需要暖和的衣服。

2）后可接不定式。

I don't think you need to hurry up ; it is still early.

我认为你没必要这么匆忙，还早着呢。

The house needs to be repaired .

这房子需要修理。

Does he need to go away so soon?

他有必要这么快就走吗？

3）后可接动名词，这时动名词与主语成被动关系: need doing= need to be done。

The house needs repairing/to be repaired .

这房子需要修理。

The trees need watering/to be watered .

这些树需要浇水。

The child needs looking after/to be looked after .

这个小孩需要照料。

4）后可接复合宾语。

I need you to come to help me with my children.

我需要你来帮我照料孩子。

Do you need the book back tomorrow?

你明天要收回那本书吗？

I need my radio repaired .

我要人修理我的收音机。

专项练习

1. You _______ pay the money, but you _______ do so at once.

A. needn't; must

B. need; need

C. must; must

D. must; needn't

2. —Shall I tell John about it?

—No, you _______. I've told him already.

A. needn't

B. wouldn't

C. mustn't

D. shouldn't

3. There was plenty of time, she _______.

A. mustn't have hurried

B. couldn't have hurried

C. must not hurry

D. needn't have hurried

4. You don't need _______ for his permission every time you want to leave the room.

A. to ask

B. ask

C. asking

D. being asked

5. —Must I write down the new words now?

—No, you _______.

A. needn't

B. may not

C. mustn't

D. can't

答案速查　1-5　DADAA