| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] have been a | 108 |
|
| 2 | [not/n't] have a problem | 28 |
|
| 3 | have been a problem | 19 |
|
| 4 | [not/n't] been a problem | 9 |
|
