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