1. Mẹ của tôi đang dọn bếp bây giờ
My mother is cleaning the kitchen now
My mother is not cleaning the kitchen now
Is your mother cleaning the kitchen now
2. Cậu ấy làm việc ở hà nội vào năm 2010
He worked in Hn in 2010
He didn't work in HN in 2010
Did he work in Hn in 2010
3. 2 năm nữa tôi sẽ trở về quê tôi
2 years later I will come back to my hometown
2 years later I will not come back to my hometown
Will you come back to your hometown 2 years later