Question

All the food has been eaten

Answer 1

Question ( in passive voice ): All the food has been eaten.

While converting a sentence in passive voice to a sentence in active voice, the subject and object of the original sentence get interchanged. In this sentence, the doer of the verb is missing. Therefore, we assume 'someone' in place of doer.

Answer ( in active voice ): Some one has eaten all the food.

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Answer 2

Explanation:

All the food has been eaten