| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] happen when | 403 |
|
| 2 | it [verb] when | 279 |
|
| 3 | it happen [conj] | 172 |
|
| 4 | it happen [subord] | 64 |
|
| 5 | it happen when | 24 |
|
