| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it is [adv] | 2851 |
|
| 2 | it is [adv] [v-ing] | 594 |
|
| 3 | [subord] it is [v-ing] | 325 |
|
| 4 | [subord] is [adv] [v-ing] | 13 |
|
