3. My new jeans are more expensive than yours.
⇒ Your new jeans are cheaper than mine.
4. If Nam doesn't phone Hoa immediately, he won't get more information about the exam.
⇒ Unless Nam phones Hoa immediately, he won't get more information about the exam.
5. "Do you play for your school team tomorrow, Tom?" said Mary.
⇒ Mary asked if you played for her school team next day.

5. mary asked Tom if he played for his school team the folowing day
4 unless he phones Hoa immediately,  he won't get more information about the exam.
3 your new jeans are not as expensive as my new jeans
 

1. Susan has lost her sport bag. She bought it last week.
⇒ Susan has lost her sport bag which she bought last week.
2. Mr. Pike began to work at this school 15 years ago.
⇒ Mr.Pike has worked at this school for 15 years.
3. My new jeans are more expensive than yours.
⇒ Your new jeans are cheaper than mine.
4. If Nam doesn't phone Hoa immediately, he won't get more information about the exam.
⇒ Unless Nam phones Hoa immediately, he won't get more information about the exam.
5. "Do you play for your school team tomorrow, Tom?" said Mary.
⇒ Mary asked if you played for her school team next day.