Multiple choice Directions: Change the voice. I have eaten all the cookies. All the cookies were eaten by me. All the cookies had eaten by me. All the cookies have been eaten by me. All the cookies had been eaten by me. None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation Object becomes subject (All the cookies)+ have + been + past participle (eaten) + by + object (‘I’ changes to 'me').