| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [be] | 41670 |
|
| 2 | it [modal v] [be] | 41670 |
|
| 3 | [pron] could [be] | 9101 |
|
| 4 | it could [be] | 3056 |
|
