| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] [vb mod] happen to | 46 |
|
| 2 | to [Wh det] [vb mod] happen [prep] | 14 |
|
| 3 | to [Wh det] [vb mod] [vb infin] to | 11 |
|
| 4 | to [Wh det] [vb mod] [verb] to | 11 |
|
| 5 | to [pron] [vb mod] happen to | 9 |
|
| 6 | to [Wh det] [vb mod] happen to | 8 |
|
| 7 | to [Wh det] [modal v] happen to | 8 |
|
