| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [vb pp] for [det] | 29 |
|
| 2 | it has been [vb pp] for [det] | 22 |
|
| 3 | it have been [vb pp] for some | 16 |
|
| 4 | it have been known for [det] | 14 |
|
| 5 | it have been [vb pp] for many | 10 |
|
| 6 | it had been [vb pp] for [det] | 6 |
|
