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.

当need后面有to的时候肯定是使役动词。

A. 实义动词：
1、陈述句：I need two more peo