| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [adv] | 7872 |
|
| 2 | must [adv] | 5070 |
|
| 3 | [vb mod] then | 4733 |
|
| 4 | [modal v] then | 4733 |
|
| 5 | must then | 178 |
|
| 6 | must then | 178 |
|
