| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [v-ing] | 2521 |
|
| 2 | [prep] it is | 1497 |
|
| 3 | [prep] it [v-ing] | 458 |
|
| 4 | [prep] is [v-ing] | 84 |
|
