| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] was happen | 201 |
|
| 2 | [prep] [Wh det] happen to | 149 |
|
| 3 | [Wh det] was happen to | 117 |
|
| 4 | [prep] [Wh det] was to | 55 |
|
