| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [not/n't] have been [verb] for | 15 |
|
| 2 | [vb mod] [not/n't] have be [vb pp] for | 11 |
|
| 3 | [vb mod] not have be [verb] for | 11 |
|
| 4 | could [not/n't] have be [verb] for | 6 |
|
