| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pron] could | 2700 |
|
| 2 | [vb past] we [modal v] | 870 |
|
| 3 | [vb past] we [vb mod] | 870 |
|
| 4 | [verb] we could | 519 |
|
| 5 | [vb past] we could | 157 |
|
