| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [verb] that | 3909 |
|
| 2 | it is [vb pp] that | 3811 |
|
| 3 | it [be] established that | 43 |
|
| 4 | it be established that | 43 |
|
| 5 | it is established [conj] | 19 |
|
| 6 | it is establish that | 17 |
|
| 7 | [pron] is established that | 17 |
|
| 8 | it [is] established that | 17 |
|
