| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] established that | 44 |
|
| 2 | it be [adv] established that | 44 |
|
| 3 | it [is] [adv] established that | 36 |
|
| 4 | it is [adv] established that | 36 |
|
| 5 | it [be] well established that | 31 |
|
| 6 | it [was/were] [adv] established that | 7 |
|
| 7 | it was [adv] established that | 7 |
|
