Yes it is.
It is past tense.
"Had written" is the past perfect tense.
"Wright" isn't a verb. It does not have a tense. Perhaps you meant "write", which is a verb. The past tense of "write" is "wrote", and the past participle is "written".
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."
'Written' is the past participle of the verb 'to write'. The past tense is 'wrote'. Therefore it is an irregular verb.
By is not a verb and does not have a past tense. Buy is a verb, and the past tense is bought.
It doesn't have a past/present/future tense as it is not a verb.
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.
Verb: Walk Past Tense: Walked Past Participle: Walked Verb: Eat Past Tense: Ate Past Participle: Eaten Verb: Write Past Tense: Wrote Past Participle: Written Verb: Break Past Tense: Broke Past Participle: Broken
"Shook" is the past tense of the verb, "to shake".
The past tense of the verb to promise is promised.