| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] several times | 25 |
|
| 2 | had been [vb pp] several times | 13 |
|
| 3 | have been [vb pp] several times | 7 |
|
| 4 | have been mentioned several times | 5 |
|
