| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [verb] that | 1289 |
|
| 2 | it is [adv] [vb pp] that | 1240 |
|
| 3 | it is [adv] known [conj] | 228 |
|
| 4 | it be [adv] known that | 194 |
|
| 5 | it [be] [adv] known that | 194 |
|
| 6 | it [is] [adv] known that | 160 |
|
| 7 | it is [adv] known that | 149 |
|
| 8 | [pron] is [adv] known that | 149 |
|
| 9 | it is [adv] known [that] | 149 |
|
| 10 | it is [adv] know that | 149 |
|
