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