| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have | 5696 |
|
| 2 | [Wh det] [modal v] have | 2863 |
|
| 3 | [Wh det] could [verb] | 1704 |
|
| 4 | [Wh det] could [vb infin] | 1702 |
|
| 5 | [Wh det] could have | 295 |
|
