| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why should [pron] | 1312 |
|
| 2 | [adv] should [ex0] | 34 |
|
| 3 | why [modal v] [ex0] | 29 |
|
| 4 | why [vb mod] [ex0] | 29 |
|
| 5 | why should [ex0] | 27 |
|
