| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] [v-ing] [prep] | 562 |
|
| 2 | [pron] [is] [adv] [v-ing] [to] | 301 |
|
| 3 | it [be] [adv] [v-ing] [to] | 153 |
|
| 4 | it [is] [adv] [verb] [to] | 147 |
|
