• Negative or interrogative
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  • Chuyển câu sau thành câu phủ định với thì Quá khứ đơn: He went to swimming pool yesterday.
    He didn't go to swimming pool yesterday.
  • Chuyển câu sau thành câu hỏi với thì Quá khứ đơn: They had dinner at nine o'clock yesterday.
    Did they have dinner at nine o'clock yesterday?
  • Chuyển câu sau thành câu phủ định với thì Quá khứ đơn: Helen ate too many sweets last night.
    Helen didn't eat too many sweets last night.
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