| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb mod] i [verb] a | 10 |
|
| 2 | why [modal v] i [vb infin] a | 10 |
|
| 3 | why should i [verb] a | 7 |
|
| 4 | why should i [verb] a | 7 |
|
