| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] it [v-ing] [prep] | 145 |
|
| 2 | [is] [pron] [v-ing] [to] | 128 |
|
| 3 | [is] it [verb] [to] | 50 |
|
| 4 | [be] it [v-ing] [to] | 49 |
|
