| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happen [prep] | 2328 |
|
| 2 | [vb infin] [Wh det] happen | 331 |
|
| 3 | [vb infin] happen [prep] | 213 |
|
| 4 | [vb infin] [Wh det] [prep] | 134 |
|
