| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb mod] not a [noun] | 8 |
|
| 2 | why [modal v] not a [noun] | 8 |
|
| 3 | why [modal v] not a [noun sg] | 8 |
|
| 4 | why [modal v] not a [noun] | 7 |
|
| 5 | why [modal v] n't a [noun] | 7 |
|
