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Generally, we use the passive when the focus is on the action and NOT on WHO or WHAT is performing the action.
Construction: was/were + past participle (helped, known)
We use the passive:
(1) The subject is unknown, therefore, we don’t know who or what is the subject.
- Something was stolen from our garage last night.
(2) We use the passive to emphasise the subject.
- The queen was told to listen.
(3) We use the passive to talk about general truths.
- The earth was occupied by dinosaurs over sixty-five million years ago.
(4) We can use the passive if we want to be unclear or vague about the subject.
- A suitcase was found at the airport. (We don’t know about the specific contents of the suitcase, as a result, we use the passive).
(5) We use the passive when the subject is irrelevant. (We don’t care who or what has caused the action to be).
- Great literature was written in the late eighteenth century.
(6) We use the passive in a more formal atmosphere like a thesis or an important piece of writing, especially scientifically speaking.
- The elements of the structure were put into the mix.