| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have not been a | 179 |
|
| 2 | has not been a | 103 |
|
| 3 | had not been a | 94 |
|
| 4 | have not been an | 37 |
|
| 5 | have not been a | 10 |
|
| 6 | 's not been a | 8 |
|
