Ex4: Change the sentences into Impersonal passive (It+to be + that...)
1. It is believed that 13 is an unlucky number
2. It used to be thought that the earth was flag
3. It was declared that she won the competition
4. It is known that English is an international language
5. It is thought that Jack London's life and writing represent the American love of ...
6. It is said that John is the brightest student in the class
7. It was reported that the president had suffered a heart attack
8. It is thought that he has died a natural death
9. It has been reported that the troops were coming
