It is a mental action verb, you cannot see someone/yourself believing, but you can believe in one's mind.
It is an action verb.
began is an action verb, not a linking verb.
what follows a linking or action verb
action verb because you did this action (sent)
It is an action verb.
action verb
Action verb
Action verb
An action verb
The verb stay is an action verb.
Yes,waiting is a action verb