| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [verb] that | 1206 |
|
| 2 | it is [adv] [vb pp] that | 1169 |
|
| 3 | it be [adv] established that | 44 |
|
| 4 | it [be] [adv] established that | 44 |
|
| 5 | it is [adv] established [conj] | 39 |
|
| 6 | it is [adv] establish that | 36 |
|
| 7 | [pers pn] is [adv] established that | 36 |
|
| 8 | it is [adv] established that | 36 |
|
| 9 | it is [adv] established that | 36 |
|
| 10 | [pron] is [adv] established that | 36 |
|
| 11 | it [is] [adv] established that | 36 |
|
