非谓语动词的用法

He helped him (to) carry things.

一般式动名词

表示动作与谓语动词表示的动作同时发出。 We enjoyed seeing the film.
I am thinking of taking over the job. 在动词insist on; rely on; count on(相信)等后表示动作在谓语动词表示的动作之后发生。 He insisted on doing that work 在有些明确表示时间先后的动词和介词on; upon after代替完成动名词表示的动作在谓语动词表示的动作先发生。 I remember seeing him before.
On arriving Beijing, he went to see his friend.

一般式分词

现在分词

持续性动词

说明分词表示的动作和句中谓语动词表示的动作同时发生。 He stood there speaking.