| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [modal v] not [adj] | 47 |
|
| 2 | why [vb mod] not [adj] | 47 |
|
| 3 | [adv] could not [adj] | 10 |
|
| 4 | why could [adv] [adj] | 9 |
|
| 5 | why could not [adj] | 9 |
|
