| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [conj] [art] | 443 |
|
| 2 | [Wh det] could [vb infin] [art] | 352 |
|
| 3 | [Wh det] could [vb infin] [conj] | 54 |
|
