Chuyển những câu sau theo gợi ý trong ngoặc
1 We used to go to school by bus ( negative)
2 Did he use to ride a bike for exercise? (affirmative)
3 Tim used to be a taxi driver (interrogative)
4 He used to to smoke ten cigarettes a day (negative)
5 You used to ride a motorbike without wearing a helmet (interrogative)
1We didn't use to go to school by bus.
2He used to ride a bike for exercise.
3Did Tim use to be a taxi driver?
4He didn't use to smoke ten cigarettes a day.
5Did you use to ride a motorbike without wearing a helmet?
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