| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [not/n't] been [prep] | 149 |
|
| 2 | has [not/n't] been a | 137 |
|
| 3 | has been [prep] a | 130 |
|
| 4 | [not/n't] been [prep] a | 68 |
|
