| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb base] not | 1728 |
|
| 2 | why [vb base] n't | 1717 |
|
| 3 | why do not | 1644 |
|
| 4 | why have not | 84 |
|
| 5 | why [vb base] not | 11 |
|
