When to use the passive:
when you want
to focus on the person or thing affected by the action, or the action
when it is not important who or what did the action;
when you want to be impersonal or more formal, as in most forms of academic writing.
Form the passive by:
the object of the active sentence into the subject of the passive sentence
changing the verb to a passive form by adding the appropriate form of the verb 'to be' and the past participle of the main verb.
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