| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [be] [vb pp] | 4744 |
|
| 2 | [modal v] only [be] [vb pp] | 2490 |
|
| 3 | [vb mod] only [be] [vb pp] | 2490 |
|
| 4 | could only [be] [verb] | 512 |
|
| 5 | could only [be] [vb pp] | 506 |
|
