| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [vb pp] for some | 16 |
|
| 2 | it have been [vb pp] for some | 16 |
|
| 3 | it has been [vb pp] for some | 12 |
|
| 4 | it have been known for some | 9 |
|
