| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] [vb past] happen [prep] | 112 |
|
| 2 | [prep] [Wh det] [vb past] happen [prep] | 112 |
|
| 3 | [prep] [Wh det] [verb] happen to | 101 |
|
| 4 | [prep] [Wh det] [vb past] [verb] to | 60 |
|
| 5 | [prep] [Wh det] [vb past] happen to | 53 |
|
| 6 | [prep] [pron] [vb past] happen to | 53 |
|
| 7 | [prep] [Wh det] [vb past] happen to | 53 |
|
