The past perfect tense of join is had joined.
The past perfect tense of join is had joined.
The past perfect tense of the verb "ask" is "had asked." For example, "She had asked him to join her."
The past tense of join is joined.
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.
The past perfect tense of hope is had hoped.
The past perfect tense is had submitted.
The past perfect tense is had chosen.
The past perfect tense is "had confronted".
The past perfect tense is had set.
The past perfect tense is had burned.