| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could | 87089 |
|
| 2 | what [vb mod] | 10515 |
|
| 3 | what [modal v] | 10515 |
|
| 4 | [Wh det] could | 4543 |
|
| 5 | what could | 978 |
|
| 6 | what could | 978 |
|
