Volkh 1  Ought to
2  Must
3 might
4 Could
5 can't
6 Should
7 Would
8 couldn't
9 have to
10 mustn't
11 shouldn't
12 should
13 don't have to
14 should
15 had to
16 needn't
17 have to
18 may
19 can't

matchman 1 ought to. 2 shall. 3 might. 4 could. 5 can't. 6 could. 7 may. 8 couldn't. 9 have to. 10 mustn't. 11 shouldn't. 12 should. 13 don't have to. 14 should. 15 had to. 16 needn't. 17 have to. 18 may. 19 can't.