| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [adv] [be] | 9388 |
|
| 2 | [vb mod] [adv] [be] [v-ing] | 3322 |
|
| 3 | it [vb mod] [be] [v-ing] | 536 |
|
| 4 | it [vb mod] [adv] [v-ing] | 6 |
|
