| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [verb] not they do | 10 |
|
| 2 | why [verb] n't they do | 10 |
|
| 3 | why do not they do | 9 |
|
| 4 | why [verb] not they do | 9 |
|
| 5 | why [vb past] not they do | 5 |
|
| 6 | why [vb base] not they do | 5 |
|
| 7 | why did not they do | 5 |
|
