| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which could [adv] have | 60 |
|
| 2 | which could [adv] have | 38 |
|
| 3 | which could not have | 22 |
|
| 4 | which could not have | 22 |
|
| 5 | which could [not/n't] have | 22 |
|
| 6 | which could well have | 6 |
|
| 7 | which could well have | 6 |
|
| 8 | which could easily have | 5 |
|
| 9 | which could easily have | 5 |
|
