Multiple choice Directions: Change the voice of the given sentence. We had stolen all the pens. All the pens were stolen by us. All the pens had to be stolen by us. All the pens had been stolen by us. All the pens were to be stolen by us. Reveal answer Fill a bubble to check yourself C Correct answer Explanation While changing the voice from active to passive, past perfect tense gets converted into past perfect continuous tense.