The dog suddenly turned friendly. Action or linking verb?

Since friendly describes the subject, turned must be a linking verb.

In the sentence "The dog suddenly turned friendly," the verb "turned" is an action verb. It describes the action of the dog changing from being unfriendly to being friendly.

To determine whether "turned" is an action verb or a linking verb, we should consider its function in the sentence.

If "turned" is used in the sense of physically changing position or direction, it would be an action verb. For example, "She turned the corner" or "He turned the page."

However, in the given sentence "The dog suddenly turned friendly," "turned" is not referring to a physical action but rather a change in the dog's demeanor or temperament. In this case, "turned" is acting as a linking verb, connecting the subject "dog" with the adjective "friendly."

So, in this sentence, "turned" is a linking verb.