• [DES B1] Unit 19
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  • Câu nào sau đây đúng ngữ pháp theo quy tắc của Modal Verb?.
    She can swim.
  • My grandfather ___ swim very well when he was young.
    could
  • ___ I come in, Teacher? (Dùng cách hỏi lịch sự, trang trọng).
    May
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