| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [verb] not | 48 |
|
| 2 | why do not | 46 |
|
| 3 | why does not | 29 |
|
| 4 | why [vb -s] not | 29 |
|
| 5 | why [vb base] not | 11 |
|
| 6 | why do not | 10 |
|
| 7 | why [vb past] not | 8 |
|
| 8 | why did not | 7 |
|
