A linking verb joins a subject with a predicate adjective, noun, or pronoun. The most common linking verbs are forms of the verb 'to be'. Other common linking verbs are 'seem', 'become', 'grow', 'smell', and 'taste':
If you are not sure whether a verb is a linking verb or an action verb, try substituting a form of of the verb 'to be' for the verb. The verb is a linking verb if the meaning of the sentence is not significantly altered:
A linking verb is sometimes referred to as a copula.