need to do sth “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jOgNOoQtrJhave有逻辑上的主谓关系） My bike needs to be fixed. 我的自行车需要修理。

have need to do sth.v.必须做某事
I have need to finish my homework.

I need your homework to be done at once.
They'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 newww.souquanme.comed some moneyjOgNOoQtrJ to buy clothes .
我需要一些钱买衣服 。