| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [verb] n't [pers pn] come back | 9 |
|
| 2 | why do n't [pron] come back | 9 |
|
| 3 | why [verb] n't you come back | 9 |
|
| 4 | why [verb] n't you come back | 9 |
|
| 5 | why [vb base] n't [pron] come back | 6 |
|
| 6 | why do n't [pron] come back | 6 |
|
