| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] for many | 30 |
|
| 2 | have been [vb pp] for many | 19 |
|
| 3 | had been [vb pp] for many | 15 |
|
| 4 | have been used for many | 14 |
|
| 5 | have been known for many | 10 |
|
