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 the verb 'am' is 'was' or 'were.' The verb 'am' is derived from the verb 'to be.'
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 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.
"Shook" is the past tense of the verb, "to shake".
The past tense of the verb to promise is promised.
reside is the verb. Resided is the past tense.
The past tense of the verb take is took
The abbreviation for the past tense verb is "past."
Rich is not a verb, rich is an adjective.richen is a verb, richened is the past tense.
Departure is not a verb and does not have a past tense. Depart is a verb, and the past tense is departed.
Inactive is not a verb and does not have a past tense. Inactivate is a verb, and the past tense is inactivated.