| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has been know [prep] some | 7 |
|
| 2 | it has been know for some | 7 |
|
| 3 | it has been know for some | 7 |
|
| 4 | it has been know [prep] some | 7 |
|
| 5 | it has been known [prep] some | 7 |
|
