Question

what causes an earthquake? English grammar voice change

Answer 1

An earthquake is caused by what?

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Answer 2

An earthquake is caused by what? In this sentence, the subject will be carrying out the action that is indicated by verb.

To be precise, subject will be doing the action. In passive voice, subject is not so active and the verb will be performing the action.

Passive voice is the best way to form a sentence when you want to emphasize on object or a person.