| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] | 79370 |
|
| 2 | [is] [adv] [v-ing] | 13272 |
|
| 3 | it [is] [v-ing] | 7295 |
|
| 4 | it [adv] [v-ing] | 213 |
|
