| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] a [noun sg] | 560 |
|
| 2 | [not/n't] [verb] a single [noun sg] | 134 |
|
| 3 | could [not/n't] [verb] a single | 15 |
|
| 4 | could [verb] a single [noun sg] | 6 |
|
