| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do n't [verb] | 21 |
|
| 2 | why do [not/n't] [verb] | 21 |
|
| 3 | why do [not/n't] [vb infin] | 19 |
|
| 4 | why do [not/n't] [verb] | 14 |
|
| 5 | why does [not/n't] [verb] | 5 |
|
