The past tense verb for "do" is "did."
By is not a verb and does not have a past tense. Buy is a verb, and the past tense is bought.
The past tense of the verb 'am' is 'was' or 'were.' The verb 'am' is derived from the verb 'to be.'
No - a past tense verb is a past tense verb, nothing to do with nouns.
The verb is still "to be", regardless of the tense. It is an irregular verb, and the past tense forms are was for I and he/she/it, and were for we, you, and they.
Inactive is not a verb and does not have a past tense. Inactivate is a verb, and the past tense is inactivated.
Departure is not a verb and does not have a past tense. Depart is a verb, and the past tense is departed.
Slept is the past tense of the verb sleep, so there is no past tense for it.
"These" is not a verb and does not have a past tense.
Was is a past tense of the verb "be".
Planned is a verb. It is the past tense of plan.
"Past" is not a verb, therefore it cannot have a past tense. "Passed" is a verb, in the past tense.