| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [that] | 476 |
|
| 2 | it is [adv] known | 415 |
|
| 3 | is [adv] known [that] | 149 |
|
| 4 | it is known [that] | 148 |
|
