| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] been [vb pp] for | 49 |
|
| 2 | it [vb past] been [vb pp] for | 49 |
|
| 3 | it had been [vb pp] for | 48 |
|
| 4 | it [vb past] been known for | 6 |
|
| 5 | it [vb past] been used for | 5 |
|
