| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could | 87089 |
|
| 2 | [Wh pn] [modal v] | 16345 |
|
| 3 | [Wh pn] [vb mod] | 16345 |
|
| 4 | [Wh pn] could | 2289 |
|
