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.
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.
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.
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.
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.
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