| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] when | 279 |
|
| 2 | it [v-ing] [conj] | 100 |
|
| 3 | [pron] [v-ing] when | 49 |
|
| 4 | it [v-ing] [subord] | 29 |
|
| 5 | it [v-ing] when | 5 |
|
