| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] when | 279 |
|
| 2 | it [vb -s] when | 111 |
|
| 3 | [pron] occurs when | 27 |
|
| 4 | it occurs [conj] | 16 |
|
| 5 | it occurs [subord] | 13 |
|
| 6 | it occur when | 9 |
|
| 7 | it occurs when | 7 |
|
