| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] be [prep] | 348 |
|
| 2 | [pron] [vb past] be on | 288 |
|
| 3 | it [verb] be on | 56 |
|
| 4 | it [vb past] [be] on | 20 |
|
