need可以作情态动词也可以作普通动词.
当它是情态动词的时候,肯定形式就是need do sth.否定形式是needn't do sth.
当它是普通动词时候,肯定形式是need to do sth.否定形式是don't need to do sth.
重要的是,need当情态动词时,一般不用于肯定句,且作为must提问的否定回答,如：
must I do the homework
no,you needn't.
need to do sth 和need do sth的区别
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