What verb category is described as not being action verbs?

The description points to linking verbs, which serve a unique function in sentences compared to action verbs. Linking verbs connect the subject of a sentence to a subject complement, which can be a noun or an adjective that describes or identifies the subject.

For example, in the sentence "The sky is blue," the verb "is" is a linking verb that connects "the sky" with its description, "blue." Unlike action verbs, which convey a physical or mental action, linking verbs do not show action but instead illustrate a state of being or condition.

This distinction is important in understanding different verb categories and how they function within sentences, making linking verbs crucial for conveying information about states or qualities rather than actions.