The past tense is involved.
Involved is the past tense of involve.
Yes.,Because formal past tense is involve in past tense.
He/she/it was involved
Both forms are involved.
You use the past tense form which is 'had'.
Is can be used in the past tense if it's in its past tense form, which is was.
"is' is present tense. For past tense use was or were.
I used the past tense to answer this question.
'Who' is a pronoun, it doesn't have a past tense. But you can use the word "was" as in "who was on the phone?".
No. The word "are" is present or future tense. The past tense would be "were".
To is not a verb and does not have a past tense.
Would is the past tense for will