| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] not [vb infin] | 179416 |
|
| 2 | why [verb] not | 2812 |
|
| 3 | why not [vb infin] | 848 |
|
| 4 | why [verb] [vb infin] | 26 |
|
