| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [conj] it is [v-ing] | 15 |
|
| 2 | [prep] [subord] it is [v-ing] | 14 |
|
| 3 | [prep] if it is [v-ing] | 12 |
|
| 4 | [prep] if it is [v-ing] | 12 |
|
| 5 | as [conj] it is [v-ing] | 11 |
|
