Passive Voice


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Mice are eaten by cats.

Although the passive voice is less common than the active voice, there are several good reasons to sometimes use the passive.

How do we make the passive?

The basic structure of a passive clause is very simple:

subject + auxiliary verb
be
+ main verb
past participle
+ by + agent
  optional

The auxiliary be is conjugated in all tenses. The main verb is always the past participle. The agent is the original “doer” of the action.

Look at some examples:

subject auxiliary verb be main verb
past participle
by  
I am employed by Apple.
You will be woken   at 6.
It will have been finished   by then.
We have been notified by Head Office.
You are being transferred   next week.
They will be paid.    

Notice above↑:

  • auxiliary be can be conjugated for all persons and tenses
  • main verb is invariable: past participle
  • if there is an agent (Apple, Head Office), it is introduced by by

Agentless passive

The subject of an active sentence “does” the action. In a passive sentence, we express the doer (or agent) through a by phrase (the long passive) or, very often, we remove it completely (the short passive). In the following example, the agent is “the Allies”:

active The Allies firebombed Dresden.
passive long Dresden was firebombed by the Allies.
short Dresden was firebombed.

The short passive is also known as the “agentless passive”. Soon you will see how useful it can be.

Negatives and questions

The table below shows examples of the passive with negative sentences, question sentences and negative-question sentences:

    subject     auxiliary verb
be
  main verb
past participle
 
  You     are not paid to watch YouTube.
  They will never be   employed by us.
? Are they         cleaned regularly?
Has your wallet     been   stolen?  
-? Is he       not notified immediately?
Will they   not be   dismissed?  
Haven’t they     been   forgotten?  

Notice above↑:

  • position of auxiliary be or first auxiliary for questions
  • possible positions of not, n’t, never to create negation

Use of the passive

When and why do we use passive voice?

There are several times when the passive voice is useful, and usually the decision has to do with the “doer” (agent) or the “receiver” of the action. For example, we use the passive when:

  1. we want to emphasize the receiver of the action:
  • President Kennedy was killed by Lee Harvey Oswald.
    cf: Lee Harvey Oswald killed President Kennedy.
  1. we don’t know who did the action (the agent):
  • My wallet has been stolen.
    cf: Somebody has stolen my wallet.
  1. we think the agent is not important or interesting:
  • Our house is being painted.
    cf: XYZ Company is painting our house.
  1. the agent is obvious:
  • I am paid weekly.
    cf: My company pays me weekly.
  1. we are making general statements or announcements:
  • Passengers are reminded to fasten their seatbelts.
    cf: The Captain reminds passengers to fasten their seatbelts.
  1. the agent is everyone:
  • The emergency services can be called by dialling 999.
    cf: The public can call the emergency services by dialling 999.
  1. we are writing formal or scientific texts:
  • Potassium was added and mixed in. The solution was heated to 80°C and then allowed to cool.
    cf: The technician added potassium and mixed it in. The technician heated the solution to 80°C and then allowed it to cool.
  1. we want to avoid responsibility for our own actions (typically found in government reports):
  • Mistakes were made and unfortunately never rectified.
    cf: The Prime Minister made mistakes and unfortunately never rectified them.

Look at this sentence:

  • He was killed with a gun.

Normally we use by to introduce the agent. But the gun is not the original doer of the action. The gun did not kill him. He was killed by somebody with a gun. In the active voice, it would be: Somebody killed him with a gun. Somebody is the agent. The gun is the instrument.

The get-passive

Although we normally construct the passive with be + past participle, it is also possible (in informal language) to use get + past participle. So if France beat England at football, we could turn this to passive and say “England were beaten by France” (be-passive) or “England got beaten by France” (get-passive). And we might also add: “But France will get thrashed by Russia.”

For formal English and exams you should use the be-passive, but in informal language people sometimes use the get-passive.

Forms of passive

The passive voice is not a tense itself. But for transitive verbs each tense, as well as other verb forms such as infinitives and participles, can be produced in the passive voice. Some of the more complicated tenses (mostly perfect continuous) are rarely used in the passive, but they are possible.

Here are some examples of the passive voice with many of the possible forms using the verb sing:

infinitive to be sung
perfect infinitive to have been sung
participle sung
perfect participle having been sung
gerund being sung
  Simple Continuous Perfect
Present am, are, is sung am, are, is being sung have, has been sung
Past was, were sung was, were being sung had been sung
Future will be sung will be being sung will have been sung

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