| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] could [pron] | 27 |
|
| 2 | [vb past] could [pers pn] | 26 |
|
| 3 | [vb past] [modal v] we | 18 |
|
| 4 | [verb] could we | 11 |
|
| 5 | [vb past] could we | 8 |
|
