These five rules are the backbone of Active and passive Voice. Subject of AV (Active Voice) is changed into the Object of PV (Passive Voice).Put “By” immediately after the form of Verb.Use third form of Verb after using the helping verb.Put HV (helping verb) according to the tense used in AV.Object of AV (Active Voice) is changed into the Subject of PV (Passive Voice).There are some rules which are necessary to learn in order to change Active Voice Sentence into Passive Voice Sentence. We usually use passive voice more in writing than in speaking when our focus is on the action and not on its doer or when we don’t know who the doer of the action is. Passive voice is a roundabout way of expressing the same thing as the active voice. The passive voice uses the word by before its object and the past participle form of the verb. In passive voice the subject and object switch places, which means that the subject receives the action and the object does the action. In active voice the subject is doing the action and the object is receiving the action, The verb form in active voice depends on the tense the sentence is in. Active voice is what is most commonly used while speaking and writing.