| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do [not/n't] [pron] [verb] back | 27 |
|
| 2 | why [verb] n't [pron] [verb] back | 27 |
|
| 3 | why [verb] [not/n't] [pron] [vb infin] back | 27 |
|
| 4 | why [verb] [not/n't] [pers pn] [verb] back | 27 |
|
| 5 | why [verb] [not/n't] you [verb] back | 22 |
|
| 6 | why [verb] [not/n't] you [verb] back | 22 |
|
| 7 | why do [not/n't] [pron] [verb] back | 20 |
|
| 8 | why [vb base] [not/n't] [pron] [verb] back | 20 |
|
| 9 | why [verb] [not/n't] [pron] go back | 16 |
|
| 10 | why [verb] [not/n't] [pron] go back | 16 |
|
| 11 | why [verb] [not/n't] [pron] come back | 9 |
|
| 12 | why [verb] [not/n't] [pron] come back | 9 |
|
| 13 | why did [not/n't] [pron] [verb] back | 6 |
|
| 14 | why [vb past] [not/n't] [pron] [verb] back | 6 |
|
