Ihave eaten是动词eat的现在完成时；Ihad eaten是过去完成时；Iwill have eaten是将来完成时。
'I have eaten' is the present perfect tense of the verb 'to eat', 'I had eaten' is the past perfect and 'I will have eaten' is the future perfect.
我们应该用过去完成时说“已经醒来”，但是“醒过来”更好，彼得总是说“醒过来”。
We ought to use the pluperfect and say wakened, but woke is better and was always used by Peter.
医生问他吃了什么。过去完成时的构成。
看来髣?要下雨。看着过去完成时结构。
“直到……结束”，常用于过去完成时。
现在完成时和过去完成时都属于完成时态。
The present and past perfect tenses both belong to the perfect tense.
李明刚刚把灯打开。过去完成时的构成。
(过去完成时)他们说生产成本已经下降了。
它们是用作现在完成时和过去完成时的助动词。
They are used as auxiliaries to the present and past perfect tenses.
大部分的语法都只是一般过去时和过去完成时。
“已是”用过去完成时，深夜在发现山洞之前。
为什么我们用过去完成时，来表示过去的事情？
Why do we use "had been warned" to describe an event happened in the past?
Andrew一喝完咖啡就走了。(过去完成时)。
当我到达那里时，工作已经做完了。（过去完成时）
他们只等了一会儿车就来了。看着过去完成时练习。
They had only been waiting for the bus several moments when it came.
你眼睛红了。过去完成时被动语态。你刚刚哭过了吗？
等，用过去完成时表示一种未实现的愿望和想法。如。
We had hoped that you would come to our English party, but you didn't.
我以为您的秘书把它们寄了。对不起。(过去完成时)。
I thought they had been posted by your secretary. I 'm sorry.
她在考试之前一直患重感冒。看看初中英语过去完成时。
She had been suffering from a bad cold when she took the exam.
这是她那一年第三次失业了。过去完成时的用法总结如下表。
It was the third time that she had been out of work that year.
(他吃完午饭后要了一杯水。)WHEN后面接过去完成时。
火车开出之前，我们就仍然到了车站。初中英语过去完成时。
我一到剧场，节目就开始了。（从句用过去完成时，主句用过去时）
No sooner had I arrived at the theatre than the performance began .
过去完成时的被动语态。我们到电影院的时候，所有的电影票都卖完了。
All the film tickets have been sold out when I got to the cinema.
当时天已亮了，于是他撒下了第四网，也是最后一网。(过去完成时)。
Day had now broken, and he cast his net for the fourth and last time.
当时天已亮了，于是他撒下了第四网，也是最后一网。(过去完成时)。
Day had now broken, and he cast his net for the fourth and last time.
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