| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [verb] [verb] | 1221 |
|
| 2 | [modal v] not [verb] [vb infin] | 42 |
|
| 3 | could [adv] [verb] [vb infin] | 22 |
|
| 4 | could [not/n't] [verb] [vb infin] | 13 |
|
| 5 | could not [verb] [vb infin] | 13 |
|
