The tense is usually called the present perfect and is as follows:
Present perfect and past perfect are two different tenses.
past perfect is formed by had + past participle.
The past participle of am is been so past perfect would be had been.
I had been at work all day.
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.'
"Shook" is the past tense of the verb, "to shake".
The past tense of the verb "promise" is "promised."
Inactive is not a verb and does not have a past tense. Inactivate is a verb, and the past tense is inactivated.
Slept is the past tense of the verb sleep, so there is no past tense for it.
The past tense of the verb "lead" is "led".
The past tense of the verb 'pull' is 'pulled'.
Departure is not a verb and does not have a past tense. Depart is a verb, and the past tense is departed.
"Past" is not a verb, therefore it cannot have a past tense. "Passed" is a verb, in the past tense.