| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that | 147 |
|
| 2 | [noun] it is [adv] that | 12 |
|
| 3 | [noun] it is [adv] known | 8 |
|
| 4 | [noun] it is known that | 6 |
|
