| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it is [prep] | 1450 |
|
| 2 | it is [v-ing] [prep] | 539 |
|
| 3 | [subord] it is [v-ing] | 325 |
|
| 4 | [subord] is [v-ing] [prep] | 14 |
|
