| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] happen to | 293 |
|
| 2 | [Wh det] [modal v] happen to | 293 |
|
| 3 | [Wh det] could [verb] to | 111 |
|
| 4 | [pron] could happen to | 33 |
|
| 5 | [Wh det] could happen [prep] | 18 |
|
| 6 | [Wh det] could happen to | 9 |
|
