| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] when | 279 |
|
| 2 | it [vb past] when | 132 |
|
| 3 | [pron] happened when | 102 |
|
| 4 | it happened [conj] | 92 |
|
| 5 | it happened [subord] | 38 |
|
| 6 | it happen when | 24 |
|
| 7 | it happened when | 14 |
|
