| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it [is] [adv] | 4252 |
|
| 2 | it [is] [adv] [v-ing] | 1372 |
|
| 3 | [subord] it [is] [v-ing] | 812 |
|
| 4 | [subord] [is] [adv] [v-ing] | 13 |
|
