| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [prep] [verb] | 227 |
|
| 2 | could [prep] [vb pp] | 212 |
|
| 3 | [modal v] [prep] done | 126 |
|
| 4 | could [prep] do | 39 |
|
| 5 | could [prep] done | 38 |
|
