Yes. 'was' is a past tense of 'is', and 'is' is a verb and so 'was' must be a verb.
Yes, was is a verb ; the simple past tense of is.
Yes, it is a verb. It is the past tense of "to have" and used as an auxiliary verb in the past perfect tense.
No, it is a verb. Specifically, it is the past tense of the verb "to go."
Sail is a regular verb not an irregular verb, and the past tense is sailed.
The word popped is a verb. It is the past tense of the verb pop.
The past tense of "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 verb for "be" is "was" or "were" depending on the subject.
The past tense of the verb 'am' is 'was' or 'were.' The verb 'am' is derived from the verb 'to be.'
The past tense of "pop" is "popped."
"Shook" is the past tense of the verb, "to shake".
The past tense of the verb "promise" is "promised."
Slept is the past tense of the verb sleep, so there is no past tense for it.
Inactive is not a verb and does not have a past tense. Inactivate is a verb, and the past tense is inactivated.
The past tense of the verb 'pull' is 'pulled'.
The past tense of the verb "lead" is "led".