The past perfect tense is had forgotten.
Forgot is the past tense of forget. There is no past tense of forgot, forgot IS past tense.
The present perfect tense of forgot is:I/You/We/They have forgotten.He/She/It has forgotten.
forgot is the past tense of forget
The past simple tense is knew. e.g. "I knew the answer but I forgot. "The perfect past tense is had known. e.g. "I had known once, but I don't know now."
The past tense of the word forget is the word "forgot".
Existed is the past tense. The past perfect tense is had existed.
I think the past is forgot and the past participle is forgottenforget / forgot / forgotten
The past tense is bled, and the past perfect tense is had bled.
The past tense of sit is sat; the past perfect tense is had sat.
The past perfect tense of hope is had hoped.
The past perfect tense is had set.
The past perfect tense is had submitted.