不定式的完成式概念：
不定式的完成式主要表示已經(jīng)完成的動作—既可能是表示先于謂語動作已經(jīng)完成，也可能是先于某個特定時間已經(jīng)完成。
如：I am sorry to have kept you waiting. (=I am sorry that I have kept you waiting) 對不起，讓你久等了。
不定式的完成式（to have+過去分詞）的用法：
1、表示在主句謂語的動作之前發(fā)生的事情：
如：I'm glad to have met your parents here. 我很高興在這兒見到了你父母（已見過）
I'm sorry to have kept him waiting for me so long. 我很抱歉讓他等了我這樣久。（已經(jīng)等過了）
2、動詞不定式的完成式和下列動詞的過去時連用，表示過去沒有實現(xiàn)的事情：plan, hope, expect, be, intend, mean,w ish,等。注意一定是它們的過去時。另外還有should/wouldlike/love。這個結(jié)構(gòu)表示“本打算/想/計劃…”的意思。
例如：The game were to have taken place in Room. 比賽原計劃在羅馬舉行。
He planned to have gone abroad last week.=He planned to go abroad but he didn't. 他原計劃上周出國的。
I'd like to have been offered the job and(to have been)given the opportunity to prove myself. 我真想（當時）把這個工作給了我，給我個機會讓我證明我自己。
同樣的意思也可用上述動詞的過去完成時加動詞不定式的一般式來表達。
例如：I had hoped to visit the great pyramid.
=I hoped to have visited the great pyramid.
=I hoped to visitit, but I didn't. 我本希望參觀大金字塔的。
They would have liked to have your help.
=They would like to have had your help.
=They wanted to have your help but they didn't have it. 他們本想得到你幫助的。
動詞不定式時態(tài)知識體系：
不定式完成式的三點用法說明：
�。�1）表示發(fā)生在謂語動作之前的動作。
如：He seems to have caught a cold. 他似乎感冒了。
I hate to have quarreled with her. 我后悔和她吵架了。
I'm sorry to have given you so much trouble. 對不起給了你這么多麻煩。
�。�2）表示在某個給定的時間之前已完成的動作。
如：I hope to have finished the work by now. 我希望現(xiàn)在以前已完成這項工作。
�。�3）表示過去未曾實現(xiàn)的想法和愿望。
如：I should like to have come earlier. 我本想早點來的。
We were to have been married last year. 我們本來打算去年結(jié)婚的。