時態(tài)語態(tài) 主動被動

一般式 to doto 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：一般現(xiàn)在時表示的動詞，有時與謂語動詞表示的動作同時發(fā)生，有時發(fā)生在謂語動詞的動作之后。

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：表示的動作發(fā)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(jìn)行時： 表示動作正在進(jìn)行，與謂語動詞表示的動作同時發(fā)生。

He seems to be eating something.

4) 完成進(jìn)行時：

She is known to have been wreaking on the problem for many years.