| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [vb pp] | 33309 |
|
| 2 | often [been] [vb pp] | 402 |
|
| 3 | has often [been] | 293 |
|
| 4 | has often [vb pp] | 175 |
|
