| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pron] could [verb] | 1131 |
|
| 2 | [Wh det] [pron] could [vb infin] | 1068 |
|
| 3 | [Wh det] [pron] [modal v] have | 1002 |
|
| 4 | [pron] [pron] could have | 175 |
|
| 5 | [Wh det] [pron] could have | 89 |
|
