| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been know for some time | 16 |
|
| 2 | [verb] been know for some time | 16 |
|
| 3 | [verb] been known for some time | 16 |
|
| 4 | [vb -s] been know for some time | 11 |
|
| 5 | has been know for some time | 10 |
|
