Answer: They are all action verbs because they typically are single words that describe what a person or thing in a sentence does (like run, write, yell, and think ). Sing, drives, and grinned are all examples of what a person does so they all fall under the category, action verbs. Meanwhile, a linking verb is a verb that connects the subject to additional information about the subject (does not express any action) such as 'will' in the first question.