Bắt đầu bằng cụm từ cho sẵn, hãy viết lại câu trên sao cho không thay đổi ý
nghĩa.
37. They travelled across India, and then flew on to Japan.
→ After they had travelled across India , they flew on to Japan.
38. People are destroying large areas of forest every day.
→ Large areas of forest are being destroyed now.
39. You won't know what to do unless you listen carefully.
→ If you don't listen carefully,you  know what to do
40. The tree that we picked these fruits from is in front of the house.
→ The tree from which we picked these fruits is in front of the house.