| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [v-ing] | 1906 |
|
| 2 | if it [is] [verb] | 1344 |
|
| 3 | if [pron] [is] [v-ing] | 752 |
|
| 4 | if it [be] [v-ing] | 372 |
|
