不定式完成式及完成進行式的用法

一、不定式完成式的用法

不定式完成式主要表示發生在謂語動作之前的動作或表示在某個給定的時間之前已完成的動作。如：

Sorry to have given you trouble. 對不起，打擾了。

I feel fortunate to have met them. 我覺得很幸運能見到他們。

I hope to have finished the work by Friday. 我希望星期五以前完成這項工作。

注：表示過去未曾實現的想法和愿望。如：

I should like to have come earlier. 我本想早點來的。

I was to have told you about it but I didn't have time to come over. 我本來要告訴你的，但我沒有時間過來。

二、不定式完成進行式的用法

不定式完成進行式主要表示在謂語動作之前一直在進行的動作。如：

You seem to have been writing very long. 你好像已經寫了很久了。

The battle was said to have been going on for two days. 據說戰斗已經進行兩天了。