Question

Change the voice

All the food has been eaten

Answer 1

All the food has been eaten by them

Answer 2

The sentence after changing the voice is following -

All the food has been eaten by them. The statement in the question in given in active voice and it is converted into passive voice.

An active voice can be referred as the set of various verb forms in which the given subject is generally the thing or person performing any action and that takes the direct object.