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.
有些人相信过去发生或现在发生的一切将来都会重演。
Some people believe whatever has happened before or is happening now will repeat itself in the future.
新的一年即将来临，现在是我回顾过去的日子并制定计划、不断进步的时候了。
The new year is around the corner, so it is time for me to look back on the past days and make plans to improve myself.
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