Chuyển đổi các câu sau thành câu bị động 1) People said he had swallowed a safety pin 2) She read the letter again and again last night 3) How many lessons are you going to learn next month ? 4) Someone had invented electric lights before I was born 5) People know that Japan produces a wide range of cars 6) Before they took exams thay had revised thei lessons 7) When he came hom his father was reading a newspaper 8) When I was 18 years old, my parents allowed me to go out in the evening

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