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.





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