1. 과거완료 의문사 +to 부정사

3. came back as I had promised. in 2001 to Sudan I

4. I came back to Sudan in 2001 as I had promised.

5. filled the city B e a u t i f u l m u s i c where they had heard only the sound of guns.

6. Beautiful music filled the city where they had heard only the sound of guns.

7. I arrived at the bus stop, had When the bus already left.

8. When I arrived at the bus stop, the bus had already left.

9. kn ow what to do so I didn’t I ra n with them from them.

10. I didn’t know what to do with them so I ran from them.

11. I how to play the musical instruments. taug ht the m

12. I taught them how to play the musical instruments.

13. t o s e e w h a t w o n d e r i n g S h e i n C h i n a. i s

14. She is wondering what to see in China.