| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is known that [noun] | 34 |
|
| 2 | it is known that [det] | 17 |
|
| 3 | it is that [det] [noun] | 15 |
|
| 4 | is known that [det] [noun] | 7 |
|
