Chuyển thành câu bị động 1. They must prepare the food tonight 2. Someone attacked Sam on Saturday night 3. The maid makes the beds every morning 4. He will write the letter next week 5. Gary had finished the project 6. Catherine is baking the birthday cake 7. Did Alison inform the police? 8. The police were watching the burglars 9. We have to wash the dishes before we go out 10. You must complete your homework tonight