| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been known for some time | 16 |
|
| 2 | have been known for some time | 16 |
|
| 3 | [vb -s] been known for some time | 11 |
|
| 4 | has been known for some time | 10 |
|
| 5 | been known for some time [conj] | 9 |
|
| 6 | been known for some time [that] | 8 |
|
| 7 | been known for some time that | 8 |
|
| 8 | been known for some time that | 8 |
|
