| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that [noun] | 38 |
|
| 2 | it is well known that [noun] | 32 |
|
| 3 | it is well known that [noun] | 32 |
|
| 4 | it is [adv] known that [noun pl] | 18 |
|
| 5 | it is [adv] known that [noun sg] | 13 |
|
| 6 | it is [adv] known that [noun prp] | 8 |
|
