Viết lại câu sao cho nghĩa ko đổi

1. the children worked

2. as the father of modern astronomy

3. there had been a train, they wouldn't have had to go by air

4. is said to have been to the island of Nagua many times

5. Where did you buy the shirt

6. not have broken your glasses on purpose

7. have been told about the delay earlier

8. he hadn't treated her so badly yesterday

9. surprised all of us was that Tom failed the exam

10. an easy exam!