| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [adv] | 7360 |
|
| 2 | could [verb] [adv] | 3631 |
|
| 3 | [modal v] [verb] both | 434 |
|
| 4 | could [verb] both | 50 |
|
