| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have [been] known for some | 9 |
|
| 2 | it have been known [prep] some | 9 |
|
| 3 | it have [been] known [prep] some | 9 |
|
| 4 | it has [been] known [prep] some | 7 |
|
