| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] [be] | 12638 |
|
| 2 | [Wh det] [modal v] [be] | 12638 |
|
| 3 | [pron] must [be] | 9041 |
|
| 4 | [Wh det] must [be] | 702 |
|
