| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do n't they do [pron] | 8 |
|
| 2 | why do [not/n't] they do [indef pn] | 5 |
|
| 3 | why do [not/n't] they do something | 5 |
|
| 4 | why do [not/n't] they do something | 5 |
|
