| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] n't have been | 620 |
|
| 2 | would n't have been | 278 |
|
| 3 | could n't have been | 182 |
|
| 4 | should n't have been | 78 |
|
| 5 | ca n't have been | 57 |
|
| 6 | need n't have been | 10 |
|
| 7 | wo n't have been | 8 |
|
| 8 | might n't have been | 6 |
|
