1. 句型转换（根据原句句义，转换句型）

1. （1） He didn't realize the importance of English until he began to work.

   Not until he began to work   the importance of English.

3. （2） The earthquake was so serious that the UN sent medical supplies to the area.

   So serious  that the UN sent medical supplies to the area.

5. （3） Though they were brave, the danger made them afraid.

   Brave   the danger made them afraid.

7. （4） If you had told him the truth, he might have made some suggestions.

    youhim the truth, he might have made some suggestions.

9. （5） Jim had hardly entered the house when it began to rain.

   Hardly  the house when it began to rain.

11. （6） Some old men from village were sitting at the back of the classroom.

    Sitting at the back of the classroom   from village.

13. （7） A boy who dropped out of school lives in the shabby house.

    In the shabby house  who dropped out of school.

15. （8） I'm a night owl and I seldom go to bed until after midnight.

    I'm a night owl and seldom  to bed until after midnight.

17. （9） The days are gone when we played together free of worries.

    Gone  when we played together free of worries.

19. （10） I had no sooner stepped into the room than I heard a scream from the next door.

    No sooner  into the room than I heard a scream from the next door.