英语 need何时情态动词 何时实意动词

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英语 need何时情态动词 何时实意动词
英语 need何时情态动词 何时实意动词

英语 need何时情态动词 何时实意动词
Need的用法
Need有两种用法,可以用做特殊动词,或者用做普通动词,二者不可兼用.
特殊动词need只用于疑问句和否定句,用来表示有必要吗或没必要.肯定式是must.
不能接名词,只能和普通动词不定式5构成合成谓语,无人称和时间变化.
Need you go there now ?
Yes, I must . No, I needn’t.
普通动词need不能提前疑问也不能加not否定,含义是需要.疑问和否定要借助于特殊动词do. 可以接名词做宾语.也可以跟4to do(=have to do) ,6doing 做宾语.有时间和人称变化.跟6做宾语时,其主语往往是物,主动形式表被动结构.
I need to use the bathroom.
Do you need to have a book ?
Yes, I do . No, I don’t need to have a book.
I need a book.
Do you need a book ?
Yes, I need a book. No, I don’t need a book.
She needs your help.
Does she need your help ?
Yes, she does. No, she doesn’t.
He needed to take a taxi,or he would be late.
Did he need to take a taxi ?
Yes, he did. No,he didn’t.
Your shoe needs mending .
Does your shoe need mending ?
Yes, it does. No,it doesn’t.

A. 实义动词:
1、陈述句:I need two more people.
2、疑问句:Do you need more people?
3、否定句:I don't need so many people.
4、句型:need + to do
-I need to go at once.
-Do I nee...

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A. 实义动词:
1、陈述句:I need two more people.
2、疑问句:Do you need more people?
3、否定句:I don't need so many people.
4、句型:need + to do
-I need to go at once.
-Do I need to go at once?
B. 助动词:
1、否定句: You needn't come with me.
He needn't eat it if he doesn't like it.
2、老式用法:
Need I come with the tool?
C. 鉴别实义动词以及助动词用法:
1、陈述句:Ineed to go at once.
如果need后面有to do,那么它就是实义动词。
因为助动词后面永远跟原形动词,比如,He should go at once.
而不是He should to go at once.
2、否定句:You needn't come with me.
这个need后面没有to come,所以,它是助动词。
同样一句话,把need当作实义动词来用,就成了:You don't need to come with me.

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当need后面有to的时候肯定是使役动词。

在肯定句中,如果随时态的变化而变化,那就是实意动词,在否定句中,如果用don't,就是实意动词,如果直接加not,就是情态动词

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