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Concourse 2

Voice – active and passive: the essentials

kick


what?

What is voice?

Voice refers to a grammatical construction and, in particular, to the relationship between the doer of an action, the agent and the recipient, the patient.  In other words, voice describes the relationship between the verb and what are called its arguments (subject and object).

Compare these two sentences:

  1. John kicked the ball.
  2. The ball was kicked by John.

Sentence 1 is in the Active voice.
The agent is the subject, John, the verb is kick + ed and the patient is the object, the ball.
Sentence 2
is in the Passive voice.
The agent is still John but he is no longer the subject of the verb.  The verb remains the same but is modified by forming the tense with the verb be.  The patient has been raised to the subject position but is still the ball.

Here are some more examples:

Active voice Passive voice
3 The police arrested her 7 She was arrested by the police
4 They have made the cake 8 The cake has been made
5 People admire him 9 He is admired
6 The dog dropped the bone in the garden 10 The bone was dropped in the garden by the dog

What is the difference in structure between active and passive sentences.  Think for a minute and then click here.


forming

Forming the passive in English

He hammered the metal
The metal was hammered
 

Traditionally, the passive in English is formed like this, starting with an active sentence.  The active sentence for our example is:
    The blacksmith formed the metal into a sword
These five steps are how we make the active sentence passive:

  1. Move the object to the front of the sentence (raising it to the subject position and making it what can now be called the patient)
        The metal ...
  2. Insert the appropriate tense of the verb be (in this case simple past)
        The metal was ...
  3. Insert the past participle of the main verb (in this case the regular form):
        The metal was formed ...
  4. Add, if the meaning requires it, the by-phrase to say who the original subject of the verb is, now called the agent:
        The metal was formed by the blacksmith ...
  5. Insert any additional information at the end
        The metal was formed by the blacksmith into a sword
    (The ordering of the by-phrase and extra information can be reversed so we can have
        The metal was formed by the blacksmith into a sword
    or
        The metal was formed into a sword by the blacksmith
    and so on.)

If you want to see how that's done with a different example, watch this little video:

Complex tense forms with longer subjects and objects conform to the same rules to convert sentences so we can form the passive from the active:
    The garage on the corner should have been servicing my and Mary's new Volvo car this week but the owner is off sick
as
    My and Mary's new Volvo car should have been being serviced by the garage on the corner this week but the owner is off sick

alternatives

Alternative ways to form passives

In the in-service guide to this area linked in the list of related guides at the end there is much more on this.  Briefly, English has two other main ways to form passive sentences:

  1. With the verb get:
        The flowers got battered by the rain
    vs.
        The flowers were battered by the rain
    The sentence with got focuses on the action of the rain (it's called a dynamic passive) but the sentence with were focuses on the state of the flowers after the rain (it's called a stative passive).
  2. With the verbs get and have:
        I had my car serviced by the garage on the corner
    or
        I got my car serviced by the garage on the corner
    In both cases, this is called a causative construction and, naturally, there's a guide on the site for more on that linked in the list of related guides at the end.

flags

Other languages

Languages deal with these things very differently.  In some, such as Mandarin, there is arguably no true equivalent.  Others, such as Greek, use a special form of the verb and some, such as Spanish, make a construction similar to the way English makes a passive.

Why can't you make a passive of something like The book fell or John arrived?
Right – the verb must be a transitive one (see the guide to word class linked in the list of related guides at the end).  In other words, there has to be an object to move to the front or patient position.


meaning

Is there a change in meaning?

You could argue that
    They baked the cake
and
    The cake was baked by them
mean the same thing.  In many older coursebooks (and some not-so-old ones) this is strongly implied by exercises requiring learners to transform sentences from one voice to another.

However, the grammar we use to express our thoughts is not randomly selected.  There is a difference between:
    The police arrested her
and
    She was arrested
and between
    People admire him
and
    He is admired
In the passive sentences we have chosen to put the most important element of the sentence at the front (that's why it's called fronting).  We do this for three main reasons:

  1. Because we are less interested in who did something and more concerned with the receiver of the action.  In the first sentence, we are concerned with what the police did.  In the second, we are interested in what happened to her.
  2. Because it's obvious what the subject is so unnecessary to state it.  The third sentence (People admire him) actually sounds odd to many and the idea is better expressed by the last sentence.  It's obvious that people do the admiring.
  3. Because we don't know what the subject is.  So, in sentences such as
        The window has been broken
    or
        My car has been stolen
    we use a passive to avoid a clumsy 'someone has' formulation.  In any case, it's the window and the car that concern us, not the vandal or the thief.
  4. Because, in order to be sensitive or for stylistic reasons, we do not want to identify the agent so we have, e.g.:
        The house was sold too cheaply
        The car has been poorly driven

    etc.

There is a fifth use of the passive which, oddly, can be used to emphasise the Subject.  This is usually a spoken form because we need to stress the subject of the verb when we speak:
    The window was broken by her (not me)
or
    She was arrested by
the police (not the customs people)

In informal speech, we often use get instead of the verb be.  E.g., I don't know how the window got broken.


question

One last question

 How do we transform this active sentence into the passive?
    The bank lent John the money
Click here when you have the answer.



Related guides
in-service guide to the passive this is a more technical guide covering some peculiarities of the passive and learner difficulties with it
the essential grammar of the sentence go here if terms like subject and object are confusing you at all
the causative a guide to a different sort of passive sentence in the in-service section
word class find out here about the different sorts of words and verbs in English


Click to do a short test on all of this.