Question Detail My mother is cooking food. Food is being cooked by my mother.Food has been cooked by my mother.Food was being cooked by my mother.Food is being cook by my mother. Answer: Option A Similar Questions : 1. Did he buy a car ? Was a car bought by him.Did car bought by him.Did a car bought by him.Were a car bought by him. Answer: Option A 2. Who wrote this book ? By whom is this book written ?By whom was this book written ?By who was this book written ?By whom were this book written ? Answer: Option B 3. they play cricket. Cricket was played by themCricket are played by them.Cricket is played by they.Cricket is play by them.Cricket is played by them. Answer: Option E 4. Mr. Sharma knows me. I am known for Mr. Sharma.I am known with Mr. Sharma.I am known at Mr. Sharma.I am known to Mr. Sharma. Answer: Option DExplanation:Note: We use "to" preposition with word "Know" 5. He had written a poem. A poem has written by him.A poem had written by him.A poem had been written by him.A poem has been written by him. Answer: Option CExplanation:Note :- Rule to make active voice of Past Perfect Tense : Passive subject + had + been + third form of verb + by + passive object Read more from - Change Of Voice Questions Answers