摘要：可能很多同学不知道动词不定式还有时态，虽然动词不定式可以表示将来的动作，但是，在有些结构中，也表示一般时态，即一般现在时态和一般过去时态。动词不定式还有完成时态和进行时态。
可能很多同学不知道动词不定式还有时态，虽然动词不定式可以表示将来的动作，但是，在有些结构中，也表示一般时态，即一般现在时态和一般过去时态。动词不定式还有完成时态和进行时态。
一，动词不定式的一般时态，表示一般现在时态和一般过去时态的动作。下面的例句就是上句的解释。结构是to do
He is said to have a brother.据说他有一个弟弟。It's said that he has a brother.（解释）He is said to live in Beijing.据说他是住在北京的。It's said that he lives in Beijing.（解释）My sister seems to be in the bedroom.我妹妹好像在卧室里。It seems that my sister is in the bedroom.（解释）二，动词不定式的进行时态，表示现在进行时态和过去进行时态。
结构 to be doing
Tom seems to be doing homework in the room now. 汤姆现在好像正在房间里做作业。It seems that Tom is doing homework in theroom.（解释）Henry pretended to be doing homework when his father came back. 爸爸回来的时候，假装正在做作业。They were believed to be swimming. 据说他们正在游泳。It was believed that they were swimming.（解释）三，动词不定式的完成时态，表示现在完成时态和过去时态。
结构 to have done
They seemed to have lived in Beijing last night.昨天晚上他们好像住在北京的。It was said that they had lived in Beijing the night before.（解释）He seems to have been to America twice.他好像去过美国两次。It seems that he has been to America twice.（解释）He is believed to have come from Yunnan.据说他已经从云南回来了。It's believed that he has come from Yunnan.（解释）来源：郑老师KMYYZY