Firemen is a noun and so doesn't have a past tense. Only verbs have tenses.
action verbs
yes they are action verbs
Vote is an action verb. Vaccinate and vandalize are action verbs.
There are two types of verbs. Linking verbs and action verbs. A linking verb is a word like is, from, but action verb shows action of the noun. Jump, skip, hop, sit are action verbs.
Action Verbs and Helping Verbs
The two kinds of verbs are action verbs and linking verbs.
The two kinds of verbs are action or transitive verbs and linking or intransitive verbs. Action verbs refer to verbs with an object denoting physical action while linking verbs are verbs without an object and only linking the subject with the predicate.
action verbs make writing exciting and easy to picture
Verbs can express actions, states, events, or occurrences in a sentence. They indicate what the subject of a sentence is doing or experiencing. Verbs can also convey tense, mood, and aspect in a sentence.
"Specialize" is typically used as an action verb when describing someone's abilities or skills. In contrast, "use," "live," and "help" can function as both action verbs or linking verbs depending on the context in which they are used.
Identify and install are action verbs. Implement and injure are verbs.