| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [verb] n't they just [verb] | 17 |
|
| 2 | why do n't they [adv] [verb] | 16 |
|
| 3 | why [verb] n't they [adv] [vb infin] | 16 |
|
| 4 | why do n't they [adv] [verb] | 9 |
|
| 5 | why [vb base] n't they [adv] [verb] | 9 |
|
| 6 | why [vb past] n't they [adv] [verb] | 8 |
|
| 7 | why did n't they [adv] [verb] | 7 |
|
