| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] able [to-vb] [adv prt] [prep] | 5 |
|
| 2 | must be able [verb] [adv prt] [prep] | 5 |
|
| 3 | must be able [verb] [adv prt] [prep] | 5 |
|
| 4 | must [be] able [verb] [adv prt] [prep] | 5 |
|
