| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [v-ing] [verb] | 72 |
|
| 2 | [vb -s] it is [adv] [verb] | 51 |
|
| 3 | [vb -s] it is [adv] [v-ing] | 39 |
|
| 4 | [vb -s] it is [v-ing] [verb] | 21 |
|
