1. Because he behaved badly, the teacher punished him.
2. These flowers should be watered often.  (hnhư b viết sai chứ k có if I đâu nha)
3. After the train left, we arrived at the station.
4. Mrs. Nhi told Lan that she had to come there then.
5. (đã có quá từ quá khứ là "did" rồi thì sao lại có từ tomorrow của tương lai? Mk vt lại câu sau khi đã thay tomorrow thành yesterday nha) His mother asked him what had he bought when he had gone to the supermarket yesterday.