| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [modal v] [not/n't] [noun] | 64 |
|
| 2 | why [modal v] a [noun] | 54 |
|
| 3 | [modal v] [not/n't] a [noun] | 39 |
|
| 4 | why [not/n't] a [noun] | 22 |
|
| 5 | why [modal v] [not/n't] a | 11 |
|
