| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happen [prep] | 2328 |
|
| 2 | [is] happen [prep] | 693 |
|
| 3 | [is] [Wh det] happen | 259 |
|
| 4 | [is] [Wh det] [prep] | 34 |
|
