| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb -s] [not/n't] it [verb] | 15 |
|
| 2 | why [vb -s] n't it [verb] | 15 |
|
| 3 | why [vb -s] [not/n't] it [vb infin] | 13 |
|
| 4 | why does [not/n't] it [verb] | 13 |
|
