| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh pn] could n't be [vb pp] | 5 |
|
| 2 | [Wh pn] could n't be [vb pp] [to-vb] | 6 |
|
| 3 | [Wh pn] could n't be [vb pp] [verb] | 6 |
|
