Chuyển sang câu thủ động 1. I finished my work at a about five o'clock 2. we use this book in our class 3. They gave him a nice present when he retired. 4. he opened the boxes and took out a cigarettes 5. do people speak english all over the world? 6. somebody planted this tree last month 7. they built this house in 1995 8. you must answer all the questions on the paper. 9. someone is singing an english song. 10. we have learn english for five years. GIÚP MIK VỚI , CẢM ƠN NHÌU

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