Question

they have completed the dinner change the voice​

Answer 1

They have completed the dinner.

• The dinner had completed by them.

Know More:-

• Active voice refers to a sentence in which the subject performs action.
• passive voice refers to a sentence in which the subject undergoes action
• while changing we have to be aware of verb .
• It is it is preceded by the preposition by.
• The object in active voice become subject in passive voice .
• The subject in active voice becomes object in passive voice .
• Always change the main verb into past participle while changing the sentence from active to to passive voice .
• The tense of the Verb will not be changed while changing the voice.