| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [adv] [v-ing] | 301 |
|
| 2 | [conj] [subord] it [is] [adv] | 253 |
|
| 3 | [subord] it [is] [adv] [v-ing] | 100 |
|
| 4 | [conj] [subord] it [is] [v-ing] | 96 |
|
