| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [adv] [vb infin] [be] | 100 |
|
| 2 | [modal v] [adv] not [vb infin] [be] | 34 |
|
| 3 | could [adv] [not/n't] [vb infin] [be] | 7 |
|
| 4 | could [adv] not [vb infin] [be] | 7 |
|
| 5 | could [adv] not [verb] [be] | 7 |
|
