| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | if it [modal v] [verb] | 353 |
|
| 2 | [v-ing] it [modal v] [verb] | 229 |
|
| 3 | [v-ing] if it [verb] | 27 |
|
| 4 | [v-ing] if it [modal v] | 16 |
|
