| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what [modal v] [be] | 913 |
|
| 2 | on [pron] [modal v] [be] | 140 |
|
| 3 | on [Wh det] [modal v] [be] | 87 |
|
| 4 | on what [modal v] [be] | 72 |
|
