The most common linking verb can be found in the various forms of “to be” (am, are, is, was, were, etc.). Sometimes, the forms of “to be” are helping verbs. Example of the difference between a linking verb and an action verb.

What type of word is was?

Was is a verb - Word Type.

What are the 4 types of verbs?

There are four TYPES of verbs: intransitive, transitive, linking, and passive.