| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [not/n't] known [subord] | 77 |
|
| 2 | it is not known [subord] | 77 |
|
| 3 | it is not known [subord] | 76 |
|
| 4 | it is [adv] known whether | 47 |
|
| 5 | it is [adv] known if | 17 |
|
| 6 | it is [adv] known when | 9 |
|
| 7 | it is [adv] known where | 5 |
|
