| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [pron] could | 6409 |
|
| 2 | why [pron] [vb mod] | 1731 |
|
| 3 | why [pron] [modal v] | 1731 |
|
| 4 | [Wh adv] [pron] could | 1347 |
|
| 5 | why [pron] could | 123 |
|
| 6 | why [pron] could | 123 |
|
