| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have not been [prep] | 211 |
|
| 2 | it have not been a | 62 |
|
| 3 | have not been [prep] a | 59 |
|
| 4 | it have been [prep] a | 35 |
|
| 5 | it not been [prep] a | 9 |
|
