(现在将来时变为了过去完成时) I knew that he had finished reading this book. (现在完成时过去完成时) I was told that he was free today.
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I have eaten是动词eat的现在完成时；I had eaten是过去完成时；I will 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.
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