| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [verb] [adv] | 633 |
|
| 2 | have [verb] at [adv] | 102 |
|
| 3 | could [verb] at [adv] | 73 |
|
| 4 | could have [verb] at | 48 |
|
| 5 | could have at [adv] | 7 |
|
