i need to do the homework.
i need to go to school.

need to do 搜趣网sthwww.souquanme.com “需要做某事”，句子的主语和need后的动词为逻辑上的主谓关系。
如： I need to have a rest. 我需要休息一下。
（句子的主语I和have有逻辑上的主谓关系） My bike needs to be fixed. 我的自行车需要修理。

I need your homew//www.souquanme.comork to be done at once.
They'搜趣网;re beginning with their work.
The bike is too dear .I can't afford it.
I often use the knife to cut it out.

need sth to do 需要某物做某事
I need some money to buy clothes .
我需要一些钱买衣服 。