41) need的用法
1.need作实义动词，意为"需要"。如：
Do you need to stay at home?你要呆在家里吗?
2.need作情态动词，一般用于对must的否定回答。如：
---Must he leave now?他必须离开吗?
---No, he needn’t.不，他不必。
3.区分：
a.need作实义动词。
He needs to go.
He doesn’t need to go.
Does he need to go?
Yes, he does./No, he doesn’t.
b.need作情态动词，一般不用于肯定句。
He needn’t go.
Need he go?
Yes, he need./No, he needn’t.