| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it [is] | 15198 |
|
| 2 | it [is] [v-ing] | 7295 |
|
| 3 | [verb] it [v-ing] | 1311 |
|
| 4 | [verb] [is] [v-ing] | 621 |
|
