| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [verb] | 37436 |
|
| 2 | has been [vb pp] | 33309 |
|
| 3 | [verb] been described | 645 |
|
| 4 | have been described | 645 |
|
| 5 | has been describe | 371 |
|
| 6 | [vb -s] been described | 370 |
|
| 7 | has be described | 361 |
|
| 8 | has [been] described | 361 |
|
| 9 | has [be] described | 361 |
|
