| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] n't have been | 620 |
|
| 2 | [modal v] n't have [det] | 366 |
|
| 3 | [modal v] have been [det] | 361 |
|
| 4 | n't have been [det] | 44 |
|
