| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [verb] a | 48 |
|
| 2 | could [adv] have [verb] a | 48 |
|
| 3 | could [adv] have [vb pp] a | 48 |
|
| 4 | could hardly have [verb] a | 11 |
|
| 5 | could easily have [verb] a | 9 |
|
| 6 | could never have [verb] a | 8 |
|
| 7 | could well have [verb] a | 6 |
|
| 8 | could [adv] have make a | 6 |
|
| 9 | could [adv] have made a | 6 |
|
| 10 | could [adv] have had a | 5 |
|
| 11 | could [adv] have have a | 5 |
|
