How do you remember what a verb is ?

There are different types of verbs like the simplest one, action verbs are verbs that you actually (remember ACTION verb) do like running, talking, writing , then there are linking verbs and helping verbs.Linking verbs are verbs that connect a subject (noun or pronoun) to an adjective or another noun (ex. of linking verbs: am, is, are, was, were, been, being). And helping verbs are verbs that helps another verb ( like the sailors ARE working). I hope this helps.   

The correct answer is d