| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [adv] [verb] [prep] | 1669 |
|
| 2 | [pron] [adv] happen [prep] | 255 |
|
| 3 | [Wh det] [adv] happen [prep] | 102 |
|
| 4 | which [adv] happen [prep] | 26 |
|
