Again, ‘I have’ shows possession or something acquired. By adding a past participle you are informing someone of a past or completed action done by you.

Here are some examples:

I have done it.
I have heard that before.
I have driven a car.
I have forgotten the words.
I have read that book.
I have eaten at that restaurant before.
I have flown in an airplane.
I have forgiven you.
I have seen you before.
I have written a letter.

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