1. 1 grammar exercise 1_1 26분

2. 2 grammar exercise 1_2 26분

3. 3 grammar exercise 2-1 29분

4. 4 grammar exercise 2-2 18분

5. 5 grammar exercise 3-1 30분

6. 6 grammar exercise 3-2 25분

7. 7 grammar exercise 4-1 27분

8. 8 grammar exercise 4-2 22분

9. 9 grammar exercise 5-1 25분

10. 10 grammar exercise 5-2 19분

11. 11 grammar exercise 6-1 25분

12. 12 grammar exercise 6-2 25분

13. 13 grammar exercise 7-1 19분

14. 14 grammar exercise 7-2 23분

15. 15 grammar exercise 8-1 21분

16. 16 grammar exercise 8-2 21분