1.All verbs have a subject,controler/doer of the verb/action. 2.Some verbs have direct objects,receiver of the verb/action.These are transitive verbs. 3.Some verbs can't have direct objects.These are intransitive verbs. 4.Linking verbs(e.g.,is) act like an equals sing(=) is dong: show something that's happening over a period of time in the present