| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] [verb] | 2609 |
|
| 2 | [modal v] [not/n't] [verb] [vb infin] | 144 |
|
| 3 | [vb mod] [not/n't] [verb] [vb infin] | 144 |
|
| 4 | could [adv] [verb] [vb infin] | 22 |
|
| 5 | could [not/n't] [verb] [vb infin] | 13 |
|
