| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had [not/n't] been a | 36 |
|
| 2 | it have not been a | 33 |
|
| 3 | it have n't been a | 29 |
|
| 4 | it has [not/n't] been a | 22 |
|
