Knew.
She knows Jack. She knew him when he was a boy.
To is not a verb and does not have a past tense.
You can use "had to" to express obligation in the past.
you could use it in the future tense e.g i will be getting a hamster on saturday. for the past tense you would use been. for the present you could use something like doing
Past - there is nothing like that to use grammatically, but the natural replacement is 'Was'. Future - will be.
The past tense of 'lase' (as in: to use a laser) should be 'lased'.
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.
The past tense is involved.
NO!!! It is the past tense of the verb 'to have'. Present tense I have You have He/she/they have Past Tense I Had You had He/she/they had Future Tense I shall have You will have He/she/they will have Not the use of 'shall/will'
Known is the past participle of know know / knows = present tense knew = past tense known = past participle knowing = present participle
'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
You can use "had to" to express obligation in the past.