| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [adv] | 137677 |
|
| 2 | [modal v] [adv] | 137677 |
|
| 3 | must [adv] | 7872 |
|
| 4 | must [adv] | 5070 |
|
