'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.
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。
We use the future perfect tense to talk about an action that will be completed at a given time in the future.
我们用将来完成时态来形容一个在未来特定的一个时间已经完成的动作。
We use the future perfect continuous tense to talk about how long an action will be going on at a future time.
我们用将来完成进行时态来形容一个行动在未来特定的时间里已进行多久了。
There are three kinds of shapes of the tenses in the Utopia Novels of the later Qing Dynasty: the future past tense, the future perfect tense and the future continuous tense.
晚清的乌托邦小说在时间构形上通常表现为“将来过去时”、“将来完成时”和“将来进行时”等三种不同面相。
There are three kinds of shapes of the tenses in the Utopia Novels of the later Qing Dynasty: the future past tense, the future perfect tense and the future continuous tense.
晚清的乌托邦小说在时间构形上通常表现为“将来过去时”、“将来完成时”和“将来进行时”等三种不同面相。
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