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.
看来髣?要下雨。看着过去完成时结构。
李明刚刚把灯打开。过去完成时的构成。
你眼睛红了。过去完成时被动语态。你刚刚哭过了吗？
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 .
埃里克几天前死了，这些年来，埃里克都是过着隐士生活。(过去完成时)。
Eric died a few days ago and these years, he had lived as a recluse.
英语状态被动语态句型结构可以是一般现在时、一般过去时、现在完成时或者过去完成时。
The English stative passive voice sentences can be the simple present, the simple past, the present perfect or the part perfect.
英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
The use of tenses in English also is better to concise, commonly used present tense, the past tense, use less when completed, the past is finished now, tense and other composite tense basic need not.
英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
The use of tenses in English also is better to concise, commonly used present tense, the past tense, use less when completed, the past is finished now, tense and other composite tense basic need not.
应用推荐