Remember, main verbs can be action or linking verbs. Action verbs can be transitive or intransitive.
We packed for the trip.
We slept all day
Intransitive verbs do not have a direct object in the sentence.
The ferret stole the dog’s toy.
The baseball broke my neighbor’s window.
Action verbs that are transitive have a direct object.
The weather was beautiful that day.
My sister is a lawyer.
Linking verbs link the subject to the subject complement. (All linking verbs are intransitive.)