在英语中,不作句子谓语,而具有除谓语外其他语法功能的动词,叫做非谓语动词.非谓语动词有动词不定式（the Infinitive）；动名词（the Gerund）；现在分词（the Present Participle）；过去分词（the Past Participle）.

I'm glad to meet you.

很高兴见到你。

He seems to know a lot.

他似乎知道很多。

The boy pretended to be working hard.

那男孩假装在努力工作。

He seems to be reading in his room.

他好像在房间里看书。