| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] it could [adv] be [verb] | 13 |
|
| 2 | [vb past] it could [adv] [be] [verb] | 13 |
|
| 3 | [vb past] it could [adv] [be] [vb pp] | 13 |
|
| 4 | [vb past] it could [not/n't] [be] [verb] | 12 |
|
| 5 | [vb past] it could not [be] [verb] | 12 |
|
| 6 | said it could [adv] [be] [verb] | 10 |
|
| 7 | [vb past] it could n't [be] [verb] | 9 |
|
| 8 | [vb past] it could [adv] [be] do | 7 |
|
| 9 | [vb past] it could [adv] [be] done | 7 |
|
