| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] | 29517 |
|
| 2 | is [adv] [v-ing] | 7370 |
|
| 3 | it is [v-ing] | 2521 |
|
| 4 | it [adv] [v-ing] | 154 |
|
