| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pron] [modal v] | 15136 |
|
| 2 | [Wh det] [pron] [vb mod] | 15136 |
|
| 3 | [pron] [pron] could | 3930 |
|
| 4 | [Wh det] [pron] could | 1915 |
|
