Examples:
We wash our hands before and after meals.
The sun rises in the east.
My uncle wears glasses.

Am, are, is, was, were, be, being, and been are all forms of the verb be. They tell what someone or something is, was, or will be.

There are three kinds of verbs, namely the action verbs, linking verbs, and helping verbs.

An action verb tells the action of a sentence.
Examples: run, hop, skip, sleep, jump, talk, snore
Mat ran to the store. Ran is the action verb.

A linking verb joins the subject and predicate of a sentence.
Examples: am, is, are, was, were
Mat was at the store. was is the linking verb.

A helping verb is used with an action verb to help the action of the sentence.
Examples: am, is, are, was, were
Mat was helping Micheal. was helps the action verb helping.