| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why have n't they | 9 |
|
| 2 | why have [not/n't] they | 9 |
|
| 3 | why have [adv] they | 9 |
|
| 4 | why have not they | 9 |
|
| 5 | why have [adv] they | 9 |
|
