| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [be] could [be] | 7 |
|
| 2 | [modal v] [be] could be | 7 |
|
| 3 | [modal v] be could [be] | 7 |
|
| 4 | could [be] could [be] | 5 |
|
| 5 | could [be] could [be] | 5 |
|
