| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do n't [verb] | 21 |
|
| 2 | why [verb] n't [vb infin] | 19 |
|
| 3 | why [vb base] n't [verb] | 15 |
|
| 4 | why do n't [verb] | 14 |
|
| 5 | why does n't [verb] | 5 |
|
| 6 | why [vb -s] n't [verb] | 5 |
|
