links, or joins, the subject of
a sentence (often a noun or pronoun) with a word or expression that identifies or describes the subject.
The most common linking verb is be in all its forms, including am, is, are, was, were, will be, has been, and was being.
Other verbs that can function as linking verbs are look, grow, feel, remain, appear, seem, sound, become, taste, stay, and smell. Mnemonic (acrostic): BF BLASTS GR(A)SS
These verbs can also be used as action verbs. To determine whether a verb is used as an
action or a linking verb, substitute seem for
the verb. If seem can be substituted, the verb is probably a linking verb.
LINKING: The crowd stayed calm.
(Seemed makes sense.)
ACTION: The crowd stayed on the street.
(Seemed cannot be substituted.)