| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] could [be] | 102 |
|
| 2 | [be] [vb pp] could | 24 |
|
| 3 | [be] could [be] | 9 |
|
| 4 | [be] [vb pp] [be] | 6 |
|
