| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] in the first | 19 |
|
| 2 | [modal v] in the first | 19 |
|
| 3 | [modal v] in the first | 19 |
|
| 4 | must in the first | 8 |
|
| 5 | must in the first | 8 |
|
