Yes it is
Yes, cough is a verb. It can be used transitively or intransitively. It can also be used as a noun.
It is an action verb.
No, cough is not an adjective. It can be either a noun or a verb.
1 form of verb
began is an action verb, not a linking verb.
action verb because you did this action (sent)
Cough is a verb because you can cough for example the man had to 'cough'.
what follows a linking or action verb
It is an action verb.
Action verb
Action verb
action verb