| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] could [not/n't] have [verb] | 46 |
|
| 2 | [noun pl] could [not/n't] have [vb pp] | 46 |
|
| 3 | [noun pl] could [not/n't] have [verb] | 46 |
|
| 4 | [noun pl] could not have [verb] | 40 |
|
| 5 | [noun pl] could [not/n't] have do | 6 |
|
| 6 | [noun pl] could n't have [verb] | 6 |
|
| 7 | [noun pl] could [not/n't] have done | 6 |
|
