| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do [not/n't] they [vb infin] [prep] | 8 |
|
| 2 | why do [not/n't] they [verb] [prep] | 8 |
|
| 3 | why do n't they [verb] [prep] | 8 |
|
