| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] could [vb infin] | 96 |
|
| 2 | [det] [prep] [Wh det] could | 31 |
|
| 3 | [det] [Wh det] could [vb infin] | 11 |
|
