| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [be] [vb pp] [conj] a | 7 |
|
| 2 | could [adv] [be] [verb] [conj] a | 7 |
|
| 3 | could [adv] be [verb] [conj] a | 7 |
|
| 4 | could [adv] [be] [verb] [subord] a | 5 |
|
