| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | can [not/n't] have been | 89 |
|
| 2 | [not/n't] have been [det] | 81 |
|
| 3 | can [not/n't] have [det] | 30 |
|
| 4 | can have been [det] | 8 |
|
