| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb -s] not | 220 |
|
| 2 | why [vb -s] n't | 191 |
|
| 3 | why does not | 190 |
|
| 4 | why has not | 30 |
|
| 5 | why [vb -s] not | 29 |
|
