An action verb
Yes.
The verb in this sentence is "passed". The verb "to pass" in the past. Quickly is the adverb 'cause it is describing how the time passed. Remember the verb is the action and the adverb describes the action.
It is an action verb.
began is an action verb, not a linking verb.
"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.
action verb
Action verb
The verb stay is an action verb.