| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] | 72140 |
|
| 2 | could [vb infin] | 71860 |
|
| 3 | [vb mod] ask | 2558 |
|
| 4 | [modal v] ask | 2558 |
|
| 5 | could ask | 249 |
|
| 6 | could ask | 249 |
|
