Simple Present Tense Cats catch mice. Mice are caught by cats. Do children love animals? Are animals loved by children?
Present Continuous Tense They are playing football. Football is being played by them. Is the teacher marking the notebooks? Are notebooks being marked by the teacher?
Present Perfect Tense Ashok has written this letter. This letter has been written by Ashok. Has Kiran plucked these flowers? Have these flowers been plucked by Kiran?
Simple Past Tense Balan stole my book. My book was stolen by Balan. Did you answer all the questions? Were all the questions answered by you?
Past Continuous Tense The postman was delivering the letters. The letters were being delivered by the postman. Was the gardener watering the flowers? Were the flowers being watered by the gardener?
Past Perfect Tense The boys had eaten all the cakes before the party began. All the cakes had been eaten by the boys before the party began.