| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has often been | 293 |
|
| 2 | have often been | 162 |
|
| 3 | had often been | 45 |
|
| 4 | 's often been | 6 |
|
| 5 | 've often been | 5 |
|
