| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] it [modal v] [be] [prep] | 166 |
|
| 2 | [Wh det] it [be] [prep] [to-vb] | 88 |
|
| 3 | it [modal v] [be] [prep] [to-vb] | 50 |
|
