| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] could [vb infin] | 14 |
|
| 2 | [vb mod] [vb infin] could [vb infin] | 14 |
|
| 3 | could [verb] could [vb infin] | 7 |
|
