| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [verb] [coord] [modal v] [verb] | 20 |
|
| 2 | [verb] [verb] [coord] could [verb] | 8 |
|
| 3 | [vb past] [verb] [conj] could [verb] | 7 |
|
