7.14 不定式的時態和語態—動詞不定式

時態\語態　　　 主動　　　　　被動
一般式　　　　　 to do　　　　　　to be done
進行式　　　　　 to be doing
完成式　　　　　 to have done　　 to have been done
完成進行式　　　 to have been doing
1) 現在時：一般現在時表示的動詞，有時與謂語動詞表示的動作同時發生，有時發生在謂語動詞的動作之後。
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：表示的動作發生在謂語動詞表示的動作之前。
I'm sorry to have given you so much trouble.
He seems to have caught a cold.
3) 進行時： 表示動作正在進行，與謂語動詞表示的動作同時發生。
He seems to be eating something.
4) 完成進行時：
She is known to have been wreaking on the problem for many years.