Question

We use the passive form when it (is/not is) obvious who is doing or did an action.

Answer 1

Respuesta:

The passive voice is used when the person who did the action is unknown, obvious/unimportant, “people in general,” or less important than the object. We can include “by… (the doer)” if we know who did the action and want to mention it because it is somewhat important.

Explicación:

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