I. Change these sentences into passive voice. (Dạng bị động) 1. Tom visits my parents every weekend. My parents............................................................................... 2. My father waters this flower every morning. This flower................................................................................ 3. John doesn’t invite Fiona to the birthday party. Fiona.......................................................................................... 4. She prepares the dinner in the kitchen. The dinner................................................................................ 5. We clean our teeth twice a day. Our teeth.................................................................................. 6. Does your teacher explain the English grammar carefully? The English grammar.............................................................. Công thức :  Nơi chốn đứng trước by O - Thời gian đứng sau by O.  Các chủ ngữ I, you, we, they, he, she, it, people, someone, no one → BỎ