| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] it [modal v] [be] [prep] [to-vb] | 50 |
|
| 2 | [Wh det] it must [be] [prep] [verb] | 10 |
|
| 3 | [pron] it must [be] [prep] [to-vb] | 9 |
|
| 4 | [Wh det] [pron] must [be] [prep] [to-vb] | 9 |
|
