| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [prep] [v-ing] [prep] | 167 |
|
| 2 | [adv] it is [prep] [v-ing] | 53 |
|
| 3 | [adv] it is [v-ing] [prep] | 40 |
|
| 4 | [adv] it is [prep] [prep] | 10 |
|
| 5 | [adv] is [prep] [v-ing] [prep] | 7 |
|
