| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been known for [det] | 14 |
|
| 2 | it has been known for [adj] | 12 |
|
| 3 | it have been known for some | 9 |
|
| 4 | it have been known for some | 9 |
|
| 5 | it have been known for many | 5 |
|
| 6 | it have been known for many | 5 |
|
