| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] a | 847 |
|
| 2 | and could [not/n't] [verb] | 467 |
|
| 3 | and [not/n't] [verb] a | 77 |
|
| 4 | and could [verb] a | 57 |
|
