| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not have been [adj] for | 29 |
|
| 2 | [not/n't] have been easy for | 9 |
|
| 3 | n't have been [adj] for | 8 |
|
| 4 | [not/n't] have been possible for | 7 |
|
