| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that | 147 |
|
| 2 | [conj] it is [adv] that | 71 |
|
| 3 | [conj] it is [adv] known | 71 |
|
| 4 | [conj] it is known that | 60 |
|
