like: You closed the window, didn → →
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You closed the window, didn't you? — Yes, I think so. ☊ 
Cậu đã đóng cửa phải không? - Đúng vậy. ☊ You closed the window, didn't you? — Yes, I think so. ☊ Cậu đã đóng cửa phải không? - Đúng vậy. ☊