What is the action verb in this sentence? He was very thirsty.
Thirsty is NOT a verb
The "simple" predicate is the main word in the predicate. It is the verb, not adverb, that shows an action or state of being. In your example, the simple predicate is "is." It's a state-of-being verb.
It is an action verb.
began is an action verb, not a linking verb.
action verb because you did this action (sent)
what follows a linking or action verb
It is an action verb.
Action verb
Action verb
action verb
An action verb
The verb stay is an action verb.