| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] happens when | 294 |
|
| 2 | it [verb] when | 279 |
|
| 3 | it [vb -s] when | 111 |
|
| 4 | it happens [conj] | 50 |
|
| 5 | it happen when | 24 |
|
| 6 | it happens [subord] | 14 |
|
| 7 | it happens when | 6 |
|
