A verb is a word that expresses an action or a state of being. A verb forms the predicate of a sentence. To have a complete sentence, you must have a verb.
There are two types of verbs.
Action verbs are verbs that express an action-physical or mental.
Linking verbs are verbs that express a state of being
Examples of verbs expressing physical action:
run
talk
dance
shout
cook
Examples of verbs expressing mental action:
think
believe
fear
want
wonder
Examples of linking verbs:
am
is
are
was