Yes, the word 'watched' is the past tense of the verb 'to watch', an act and therefore an action verb.
"Watched." When looking for a verb, look for the action.
It can be an adjective or a verb or adverb
watched
It is an action verb.
began is an action verb, not a linking verb.
Yes, "has" is a helping verb that is used to form the present perfect tense in English.
Watch can be a verb eg -- We watch TV every night Watch can be a noun eg -- She lost her new watch
no, watched is the past tense form of the verb watch.
"Sent" is an action verb. It shows an action, such as "she sent an email."
what follows a linking or action verb
Action verb
It is an action verb.