| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] have [verb] [art] | 157 |
|
| 2 | [modal v] [not/n't] have have [art] | 92 |
|
| 3 | could [adv] have have [art] | 27 |
|
| 4 | could [not/n't] [verb] have [art] | 27 |
|
| 5 | could [not/n't] have have [art] | 16 |
|
