| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [verb] in a | 25 |
|
| 2 | it have been [vb pp] in a | 22 |
|
| 3 | it has been [verb] in a | 12 |
|
| 4 | it had been [verb] in a | 10 |
|
