| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] not [verb] | 103518 |
|
| 2 | why [vb base] not | 1728 |
|
| 3 | why not [verb] | 909 |
|
| 4 | why [vb base] [verb] | 16 |
|
