| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] could [verb] | 1704 |
|
| 2 | [Wh det] could [vb infin] | 1702 |
|
| 3 | [Wh det] [modal v] increase | 63 |
|
| 4 | [pron] could increase | 35 |
|
| 5 | [Wh det] could increase | 8 |
|
