| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [v-ing] [to-vb] | 69 |
|
| 2 | [subord] it is [adv] [v-ing] | 56 |
|
| 3 | [subord] it is [v-ing] [to-vb] | 36 |
|
| 4 | [subord] it is [adv] [to-vb] | 14 |
|
