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.