| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do n't they [verb] the | 6 |
|
| 2 | why do [not/n't] they [verb] the | 6 |
|
| 3 | why do [not/n't] they [vb infin] the | 6 |
|
| 4 | why do [not/n't] they [verb] the | 6 |
|
