| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been know for some time | 16 |
|
| 2 | have been know for some time | 16 |
|
| 3 | have been know [prep] some time | 16 |
|
| 4 | have been known [prep] some time | 16 |
|
| 5 | have been know [prep] some time | 16 |
|
| 6 | has been know [prep] some time | 10 |
|
