| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] [was/were] | 58 |
|
| 2 | could [be] [vb pp] [was/were] | 58 |
|
| 3 | could [be] done [be] | 6 |
|
| 4 | [modal v] [be] done [was/were] | 5 |
|
| 5 | could [be] do [was/were] | 5 |
|
