7.14 不定式的时态和语态
时态/语态(主动,被动)
一般式:to do,to be done
进行式:to be doing
完成式:to have done,to have been done
完成进行式:to have been doing
1)现在时:一般现在时表示的动词,有时与谓语动词表示的动作同时发生,有时发生在谓语动词的动作之后。
He seems to know this.
I hope to see you again.
=I hope that I'll see you again.我希望再见到你。
2)完成时:表示的动作发生在谓语动词表示的动作之前。
I'm sorry to have given you so much trouble.
He seems to have caught a cold.
3)进行时:表示动作正在进行,与谓语动词表示的动作同时发生。
He seems to be eating something.
4)完成进行时:
She is known to have been wreaking on the problem for many years.