use of passive

Passive voice is used when the focus is on the action. It is not important or not known, however, who or what is performing the action.

Example: My bike was stolen.

In the example above, the focus is on the fact that my bike was stolen. I do not know, however, who did it.

Sometimes a statement in passive is more polite than active voice, as the following example shows:

Example: A mistake was made.

In this case, I focus on the fact that a mistake was made, but I do not blame anyone (e.g. You have made a mistake.).

Form of Passive
Subject + finite form of to be + Past Participle (3rd column of irregular verbs)

Example: A letter was written.

When rewriting active sentences in passive voice, note the following:

■the object of the active sentence becomes the subject of the passive sentence
■the finite form of the verb is changed (to be + past participle)
■the subject of the active sentence becomes the object of the passive sentence (or is dropped)
Examples of Passive Level: lower intermediate
Tense Subject Verb Object
Simple Present Active: Rita writes a letter.
Passive: A letter is written by Rita.
Simple Past Active: Rita wrote a letter.
Passive: A letter was written by Rita.
Present Perfect Active: Rita has written a letter.
Passive: A letter has been written by Rita.
Future I Active: Rita will write a letter.
Passive: A letter will be written by Rita.
Hilfsverben Active: Rita can write a letter.
Passive: A letter can be written by Rita.

Examples of Passive Level: upper intermediate
Tense Subject Verb Object
Present Progressive Active: Rita is writing a letter.
Passive: A letter is being written by Rita.
Past Progressive Active: Rita was writing a letter.
Passive: A letter was being written by Rita.
Past Perfect Active: Rita had written a letter.
Passive: A letter had been written by Rita.
Future II Active: Rita will have written a letter.
Passive: A letter will have been written by Rita.
Conditional I Active: Rita would write a letter.
Passive: A letter would be written by Rita.
Conditional II Active: Rita would have written a letter.
Passive: A letter would have been written by Rita.