| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that | 147 |
|
| 2 | it is [adv] known [that] | 147 |
|
| 3 | it is [adv] known that | 147 |
|
| 4 | it is well known [conj] | 109 |
|
| 5 | it is now known [conj] | 20 |
|
| 6 | it is also known [conj] | 10 |
|
