This document discusses the difference between transitive and intransitive verbs. Transitive verbs are followed by an object, while intransitive verbs are not. Common examples of transitive verbs include mailed, signed, and killed. Common intransitive verbs include agree, exist, live, and sleep. Only transitive verbs can be used in the passive voice. Intransitive verbs cannot be used in the passive voice. Some verbs can be either transitive or intransitive depending on how they are used.