Main verbs have meanings related to actions, events and states. Most verbs in English are main verbs:
We went home straight after the show.
It snowed a lot that winter.
Several different types of volcano exist.
Some main verbs are called linking verbs (or copular verbs). These verbs are not followed by objects. Instead, they are followed by phrases which give extra information about the subject (e.g. noun phrases, adjective phrases, adverb phrases or prepositional phrases). Linking verbs include:
A face appearedat the window. It was Pauline. (prepositional phrase)
He’sa cousin of mine. (noun phrase)
This coat feelsgood. (adjective phrase)
She remainedoutside while her sister went into the hospital. (adverb phrase)