| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why has n't [pron] | 15 |
|
| 2 | [Wh adv] has n't [pers pn] | 10 |
|
| 3 | [Wh adv] has n't he | 6 |
|
| 4 | [Wh adv] has n't he | 6 |
|
