| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] established that | 43 |
|
| 2 | it be established [that] | 43 |
|
| 3 | it [was/were] established [that] | 25 |
|
| 4 | it was established [that] | 25 |
|
| 5 | it is established [that] | 17 |
|
| 6 | it [is] established [that] | 17 |
|
