Tips on using Voice:
Tip #1: Let
If the given sentence in the active voice is in the imperative form, to get the passive voice use ‘Let’.
Formation of Passive Voice = Let + Object + be + Past Participle
Active: Help me.
Passive: Let me be helped.
Active: Open the door.
Passive: Let the door be opened.
Tip #2: Helping verbs like am, is, are, was, were, will, have, should, could, will
If the question in the Active Voice begins with a Helping verb the Passive voice must also begin with a suitable helping verb.
Active: Are you writing a letter?
Passive: Is a letter being written by you?
Active: Will you write a letter?
Passive: Will a letter be written by you?
What, When, Who, Why, How:
If the question begins with ‘Wh’ or How’ form (what, when, how, etc.) the Passive Voice must begin with the same. Only ‘who’ gets replaced by ‘By whom’.
Active: Why did you break the box?
Passive: Why was the box broken by you?
Active: Who broke the window?
Passive: By whom was the window broken?
Tip #3: Gerund, Infinitive
When used in passive form, gerund and Infinitive are formed differently.
Infinitive: passive is formed as ‘to be + past participle’
Active: I want to shoot the tiger.
Passive: I want the tiger to be shot.
Gerund: passive is formed as ‘being + past participle’
Active: I remember my father taking me to the theatre.
Passive: I remember being taken to the theatre by my father.
Tip #4: Direct and Indirect Object
If a sentence contains two objects namely Indirect Object and Direct Object in the Active Voice, two forms of Passive Voice can be formed.
Active: She brought me a cup of coffee.
Passive: (I) I was brought a cup of coffee by her.
Passive: (II) A cup of coffee was brought to me by her.
Object Complement: When made passive, these objects complements become subject complements; they come after the verb.
Active: They elected him their leader.
Passive: He was elected their leader.
Tip #5: Cases where ‘by’ is not used
With: use with in place of ‘by’ to talk about an instrument used by the agent/subject.
Active: Somebody hit the dog with a stick.
Passive: (I) The dog was hit by with a stick.
Passive: (II) The dog was hit by a boy.
Impersonal Passive: In scientific / technical / business writing, the emphasis is usually on the action or process. So the ‘by’ phrase is generally omitted.
Active: One finds mosquitoes everywhere.
Passive: Mosquitoes are found everywhere.