| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] happen [prep] | 836 |
|
| 2 | [Wh pn] happen [prep] | 121 |
|
| 3 | [Wh pn] [adv] [prep] | 91 |
|
| 4 | [Wh pn] [adv] happen | 22 |
|
