Had swum.
The past tense is swam. (I swam, you swam, they swam) The past participle is swum. Present perfect : he has swum Past perfect : he had swum Future perfect: he will have swum
The past tense of swim is swam.
The past tense is swam.The future tense is will swim.
swam is the simple past swum is the the perfect past swum. it sounds strange but it is correct We went to my son's swim meet last week, and he swam better than he ever has.The past tense word of swim is SWAM
Existed is the past tense. The past perfect tense is had existed.
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.
Yes, "could" is the past tense of "can." For example, "I can swim" changes to "I could swim" in the past tense.
The past perfect tense is "had confronted".
The past perfect tense is had chosen.
The past perfect tense is had burned.
The past perfect tense is had set.