| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] [prep] [art] | 269 |
|
| 2 | [not/n't] have [vb pp] [prep] [art] | 187 |
|
| 3 | could [not/n't] have [vb pp] [prep] | 182 |
|
| 4 | could [not/n't] have [vb pp] [art] | 157 |
|
