| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] several | 71 |
|
| 2 | has been [vb pp] several | 31 |
|
| 3 | had been [vb pp] several | 22 |
|
| 4 | have been [vb pp] several | 8 |
|
| 5 | have been mentioned several | 5 |
|
