| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is known to | 230 |
|
| 2 | was known to | 148 |
|
| 3 | are known to | 140 |
|
| 4 | were known to | 77 |
|
| 5 | be known to | 64 |
|
| 6 | been known to | 49 |
|
| 7 | 's known to | 5 |
|
| 8 | being known to | 5 |
|
