Verbs fall into two major categories: main verbs and auxiliary/helping verbs.

An action verb is a main verb that shows action. An action verb usually tells what the subject of a clause is doing, will do, or did. An action verb may include one or more helping verbs in addition to the main verb. Helping verbs are ……

An auxiliary verb, or helping verb, works with a main verb. Auxiliary verbs serve a variety of purposes. Some auxiliary verbs ……

A linking verb does not show action. It connects the subject of a sentence to a word or words in the predicate that describe or rename the subject. Linking verbs are usually forms of be. Some common linking verbs are ……

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