Cheap is an adjective and does not have a past tense. Verbs have different tenses.Cheapen is a verb and the past tense is cheapened.
Benefit is both a verb and a noun."I will claim my benefit today" is in noun form."This will benefit you" is in verb form.Benefits, benefiting and benefited are other verbs depending on the tense.
The past tense of produce is produced. It's a regular verb so add -ed to make the past.
The past tense of cheep is cheeped.
The past tense is also bid.
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 "do" is "did."
The word benefit can be a noun (with two major meanings) or a verb (to give a benefit or advantage). The verb forms are to benefit (infinitive), benefits (third person, singular present tense), benefiting (present participle), benefited (past tense and past participle)..
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 "promise" is "promised."
"Shook" is the past tense of the verb, "to shake".
The past tense of the verb "take" is "took."
reside is the verb. Resided is the past tense.
The abbreviation for the past tense verb is "past."
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.