| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [verb] to a | 24 |
|
| 2 | it have been [vb pp] to a | 23 |
|
| 3 | it has been [verb] to a | 17 |
|
| 4 | it had been [verb] to a | 7 |
|
