| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been known for [det] time | 11 |
|
| 2 | [vb -s] been known for some time | 11 |
|
| 3 | [vb -s] been known for some time | 11 |
|
| 4 | has been known for [adj] time | 10 |
|
