| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [verb] not [pron] [vb infin] | 1963 |
|
| 2 | [verb] not [pron] [vb infin] [pron] | 1750 |
|
| 3 | why [verb] [pron] [vb infin] [pron] | 718 |
|
