closed is the verb, yes it tells about an action.
It is an action verb.
verb
what follows a linking or action verb
Action verb
closed is the verb, yes it tells about an action.
No, "opened" is not a preposition. It is a verb that describes an action of making something not closed or sealed.
Yes, "keep" can be a stative verb when used to describe a state rather than an action, such as "to keep the door closed."
It is an action verb.
Yes, slam is a verb. Verbs show action which slam does, unless it used as a noun. For example as a noun, "the door closed with a slam." Example for a verb, "the door was slammed shut."
began is an action verb, not a linking verb.
The word "open" can be used as both an adjective and a verb. As an adjective, it describes something that is not closed or not hidden. As a verb, it refers to the action of making something accessible or available.
"Sent" is an action verb. It shows an action, such as "she sent an email."
verb
what follows a linking or action verb
It is an action verb.
action verb