| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] not [verb] | 34490 |
|
| 2 | why not [verb] | 909 |
|
| 3 | why [vb -s] not | 220 |
|
| 4 | why [vb -s] [verb] | 13 |
|
