need 不同用法

一、 情态动词:

作为情态动词时，只能用于否定句和疑问句中,或用于由if或whether引导的宾语从句中，一般不能用于肯定句。

变为疑问句时只需将情态动词提到主语的前面，

变为否定句时只需在情态动词之后加not。

1. need do sth.

NeedI buy a new book ? 我须要买本新书吗？

Yes, you must. / No, you needntHeneednt playthe piano. 他不需要弹钢琴。

2. 用need提问时，肯定回答用：must ；否定回答用：neednt.

Need Tom do housework on weekends? Yes, he must. /No, he neednt.

3. 作为"Must sb …?"句式的否定回答用: neednt，相当于 "…not have to". Must I fold my clothes now? 我必须现在叠衣服吗？

Yes, you must. No, you, you neednt. = No, you dont have to.

Must I hand in my homework now? Yes, you must./ No, you neednt.

二、 实义动词:

作为实义动词，need后面的宾语可以是名词、动名词、动词不定式或代词，这种情况下，need既可用于肯定句，也可用于否定句和疑问句，构成否定句和疑问句时要借助于助动词do或does.

1. need + n. /pron. 需要…

a.)The kids need some fruit. 孩子们需要些水果。

b.) We need a great deal of money now. 我们需要和多钱

2.need doing sth.…

=need to be done… 需要被… The young trees need watering at once. 小树需要立刻浇水。=The young trees need to be watered.

3.need to do sth. I need to take good care of my younger brother. 我要好好照料我弟弟。

三、need作为名词，含义为"缺乏，需要"；其复数表示"基本需要"。

掌握两个词组：

in (great) need of（急需） 与

meet the needs of(满足……的需要)。

a.) Theres no need for you to try again. 你不必再尝试了。

b.) The school is in great need of teachers. 这所学校急需教师。

Exercises

1. His friend needs ______（make）an effort to finish the work.

2. Need I ______(share) this apple with Tony?

3. 你不必就此事大动肝火。You ____ ___ ___ about it.

4. The dangerous houses need ___________(pull) down at once.

5. More workers ______ (need) in our factory.

6. The factory is___ ___ ___ ___ ___ money.（工厂急需资金）

答案：1. to make 2. share 3. neednt get mad 4. to be pulled / pulling

5. are needed 6. in great need of