Question

what is passive voice
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The passive voice is a grammatical construction. The noun or noun phrase that would be the object of an active sentence, such as Our troops defeated the enemy, appears as the subject of a sentence or clause in the passive voice. ☺
Ms. Sue
That sentence posted by ? is in the active voice.

The enemy was defeated by our troops is in the passive voice.

http://owl.english.purdue.edu/owl/owlprint/539/