| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [v-ing] [to-vb] | 655 |
|
| 2 | it is [adv] [v-ing] | 594 |
|
| 3 | it is [v-ing] [to-vb] | 317 |
|
| 4 | it is [adv] [to-vb] | 96 |
|
