| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb past] not | 859 |
|
| 2 | [verb] [vb past] not | 561 |
|
| 3 | [verb] why not | 104 |
|
| 4 | [verb] why [vb past] | 29 |
|
