| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [verb] for | 1650 |
|
| 2 | has been [vb pp] for | 1373 |
|
| 3 | has been established [prep] | 104 |
|
| 4 | [verb] been established for | 27 |
|
| 5 | have been established for | 27 |
|
| 6 | [vb -s] been established for | 15 |
|
| 7 | has [be] established for | 14 |
|
| 8 | has be established for | 14 |
|
| 9 | has [been] established for | 14 |
|
| 10 | has been establish for | 14 |
|
