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Introduced is a verb. It's the past tense of introduce.
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 word 'introduced' is not a noun. The word 'introduced' is the past participle, past tense of the verb to introduce. The past participle of the verb also functions as an adjective.The abstract noun forms of the verb to introduce are introduction and the gerund, introducing.
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."
Shall is an auxiliary verb, that is it is used before and in conjunction with another verb, as in, ...shall go... or ...shall be. The past tense of shall is shouldand is typically used with another auxiliary verb such as have, as in, ...should have gone... or ...should have been.
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".