. many doctors say teenagers undergo many physical and mental changes during their puberty

2. sometimes my mother tell me that i don’t have to be so tense 

3. peter said that he was looking forward to his grandfather’s gift 

4. peter said if he passed that test, his father would buy a new skateboard

5. i told my teacher that i had forgotten to do my homework 

6. jim said that mr.brown owned two cars and three hourses

7. she said to me she couldn’t do it by herself 

8. my mother siad that she would go on a business trip the next week 

9. my manager said that someone had broken into our office her previous day 

10. he told me that i might have trouble if i didn’t do my homework 

11. the singer said she had started her career three years before 

12. jim told me it was not his book, it was mine 

13. ann said to me she had just recevied a postcard from her foreign friend 

14. he said that story had happened before 

15. peter said that he hoped it would be sunny the next day