| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [verb] | 18437 |
|
| 2 | [v-ing] it [verb] | 1668 |
|
| 3 | [v-ing] is [verb] | 581 |
|
| 4 | [v-ing] it is | 388 |
|
