=> Trung didn't visit his grandparents two weeks ago. (Phủ định)
=> Did Trung visit his grandparents two weeks ago? (Nghi vấn)
Phủ dịnh ; TRung isn't visited his grandparents two weeks ago. Nghi vấn Is Trung viseted his grandparents two weeks ago ? Nhớ k cho tui nha
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