جملات مجهول + Passives

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Grammar explanation

ما از صدای مجهول برای تغییر تمرکز جمله استفاده می کنیم.

We use the passive voice to change the focus of the sentence.

My bike was stolen. (passive – focus on my bike)
Someone stole my bike. (active – focus on someone)

We often use the passive:

when we prefer not to mention who or what does the action (for example, it's not known, it's obvious or we don't want to say)
so that we can start a sentence with the most important or most logical information
in more formal or scientific writing.

We make the passive using the verb be + past participle. We start the sentence with the object.

It is not always necessary to add who or what did the action.

Only the form of be changes to make the tense. The past participle stays the same. Here are examples of the passive in its most common tenses.

Tense	Example	Structure
Present simple	Alioli is made from oil, garlic and salt.	is/are + past participle
Present continuous	The hall is being painted this week.	is/are being + past participle
Past simple	John F. Kennedy was assassinated in 1963.	was/were + past participle
Past continuous	The signs were being put up last week.	was/were being + past participle
Present perfect	Oranges have been grown here for centuries.	have been + past participle
Past perfect	When he got home, he found that his flat had been burgled.	had been + past participle
Future simple	The work will be finished next week.	will be + past participle