| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] be [verb] [noun] [prep] | 8 |
|
| 2 | could [adv] [be] [verb] [noun sg] [prep] | 5 |
|
| 3 | could [adv] [be] [vb pp] [noun] [prep] | 5 |
|
