| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] known to be | 9 |
|
| 2 | have [been] known to be | 9 |
|
| 3 | has [been] known to be | 6 |
|
| 4 | [vb -s] [been] known to be | 6 |
|
