| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb -s] be [v-ing] [prep] | 90 |
|
| 2 | it [vb -s] be [verb] at | 48 |
|
| 3 | [pron] [vb -s] be [v-ing] at | 26 |
|
| 4 | it [verb] be [v-ing] at | 9 |
|
| 5 | it [vb -s] [be] [v-ing] at | 5 |
|
