| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [prep] [v-ing] | 1207 |
|
| 2 | it is [v-ing] [to-vb] | 317 |
|
| 3 | is [prep] [v-ing] [to-vb] | 71 |
|
| 4 | it [prep] [v-ing] [to-vb] | 33 |
|
| 5 | it is [prep] [to-vb] | 28 |
|
