| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is known that [noun] [verb] | 10 |
|
| 2 | it is known that [noun] [verb] | 10 |
|
| 3 | it is known [that] [noun] [verb] | 10 |
|
| 4 | it is known [conj] [noun] [vb past] | 6 |
|
