| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have not been [prep] | 806 |
|
| 2 | have been [prep] a | 790 |
|
| 3 | have not been a | 285 |
|
| 4 | not been [prep] a | 68 |
|
| 5 | have not [prep] a | 12 |
|
