He works hard - Work is the verb, simple enough! Has has worked hard all his life. The main verb is "worked" (in past participle form) but "has" (acts as a modal) now made the tense present perfect.
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AnonymousAre gerunds verbs?No, but a gerund can take an object and may occur in the passive voice like a verb. I consider a gerund neither a verb nor a noun but a little bit of both.
Anonymousare infinitives verbs?Yes.