| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [noun prp] do n't [vb infin] | 19 |
|
| 2 | why [noun prp] did n't [vb infin] | 12 |
|
| 3 | why [noun prp] does n't [vb infin] | 5 |
|
