(1)need作为情态动词表示“需要;必须”,通常用于否定句和疑问句。如:
You needn't do it again.你不需要再做了。
Need he do his homework first?他需要先做作业吗?
(2)need作为实义动词时,通常用法是:
①人+need +to do; ②物+need +doing; ③物+need +to be done。如:
The garden doesn't need watering—it rained last night. 花园不用浇水了——昨夜刚下过雨。
A dog needs to be taken out for a walk every day. 狗得天天带出去遛。
另外,need后还可以直接跟名词。如:
Do you need any help? 你需要帮忙吗?
I need a watch.我需要一块手表。
need to do加行为动词,need doing情态动词