| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] long be established | 18 |
|
| 2 | have long be established | 18 |
|
| 3 | [verb] long been established | 18 |
|
| 4 | has long be established | 11 |
|
| 5 | [vb -s] long be established | 11 |
|
| 6 | had long be established | 5 |
|
| 7 | [vb past] long be established | 5 |
|
