| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] could not have [verb] | 275 |
|
| 2 | [noun pl] [modal v] not have [verb] | 248 |
|
| 3 | [noun pl] could not [verb] [verb] | 94 |
|
| 4 | [noun pl] could [adv] have [verb] | 88 |
|
