| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has not been | 224 |
|
| 2 | it has been [prep] | 155 |
|
| 3 | it not been [prep] | 139 |
|
| 4 | has not been [prep] | 74 |
|
| 5 | it has not [prep] | 7 |
|
