I had already vacationed there, so I declined the free airline tickets in anticipation of a different offer.
The perfect tense of "think" is "have thought." For example, "I have thought about it before."
The perfect tense of "ring" is "rung." For example, "I have rung the bell."
The past perfect tense of do is had done.
The future perfect tense of leave is will have left.
Past perfect tense - I had saved. Present perfect tense - I have saved.
The present perfect tense of burst is:I/You/We/They have burst.He/She/It has burst.
The past perfect tense is had cleaned.
The future perfect tense is will have led.
"To have destroyed" is the present perfect of "to destroy". For example: I have destroyed, he has destroyed.
The present perfect tense of "proven" is: "I had proven". It combines the present in the past tense.
Future perfect tense - Will have talked. Present perfect tense - Have/has talked.
The present perfect.