| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did n't [pron] [vb infin] [adv] | 63 |
|
| 2 | why did n't [pron] [vb infin] [adv prt] | 28 |
|
| 3 | why [verb] n't [pron] [vb infin] back | 27 |
|
| 4 | why do n't [pron] [vb infin] back | 27 |
|
| 5 | why did not [pron] [vb infin] back | 6 |
|
| 6 | why did [not/n't] [pron] [vb infin] back | 6 |
|
| 7 | [adv] did n't [pron] [vb infin] back | 6 |
|
| 8 | why did n't [pron] [vb infin] back | 6 |
|
| 9 | why [vb past] n't [pron] [vb infin] back | 6 |
|
| 10 | why did [adv] [pron] [vb infin] back | 6 |
|
| 11 | why did n't [pron] [verb] back | 6 |
|
