7.14 不定式的時(shí)態(tài)和語態(tài)
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時(shí)態(tài)\語態(tài)　　　 主動(dòng)　　　　　被動(dòng)
一般式　　　　　 to do　　　　　　to be done
進(jìn)行式　　　　　 to be doing　　
完成式　　　　　 to have done　　 to have been done
完成進(jìn)行式　　　 to have been doing　　

1) 現(xiàn)在時(shí)：一般現(xiàn)在時(shí)表示的動(dòng)詞，有時(shí)與謂語動(dòng)詞表示的動(dòng)作同時(shí)發(fā)生，有時(shí)發(fā)生在謂語動(dòng)詞的動(dòng)作之后。
　　He seems to know this.
　　I hope to see you again. = I hope that I'll see you again.　我希望再見到你。

2) 完成時(shí)：表示的動(dòng)作發(fā)生在謂語動(dòng)詞表示的動(dòng)作之前。
　I'm sorry to have given you so much trouble.
　He seems to have caught a cold.

3) 進(jìn)行時(shí)： 表示動(dòng)作正在進(jìn)行，與謂語動(dòng)詞表示的動(dòng)作同時(shí)發(fā)生。
　He seems to be eating something.

4) 完成進(jìn)行時(shí)：
　She is known to have been wreaking on the problem for many years.