| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [prep] [v-ing] | 1727 |
|
| 2 | it [is] [v-ing] [to-vb] | 833 |
|
| 3 | [is] [prep] [v-ing] [to-vb] | 89 |
|
| 4 | it [is] [prep] [to-vb] | 56 |
|
| 5 | it [prep] [v-ing] [to-vb] | 33 |
|
