| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] could [not/n't] [vb infin] a [adj] | 7 |
|
| 2 | who could [not/n't] [verb] a [adj] | 7 |
|
| 3 | [Wh pn] could [not/n't] [verb] a [adj] | 5 |
|
