| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do [not/n't] they [verb] [adv] | 6 |
|
| 2 | why do [not/n't] they [vb infin] [adv] | 6 |
|
| 3 | why do [not/n't] they [adv] [vb infin] | 9 |
|
| 4 | why do [not/n't] they [adv] [verb] | 9 |
|
