| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [adv] [verb] | 9132 |
|
| 2 | [pron] [adv] happen | 954 |
|
| 3 | [Wh det] [adv] happen | 337 |
|
| 4 | which [adv] happen | 43 |
|
