| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have often been [verb] [prep] a | 18 |
|
| 2 | have often been [vb pp] [prep] a | 18 |
|
| 3 | have often been [verb] as a | 16 |
|
| 4 | have often been [verb] as a | 16 |
|
| 5 | has often been [verb] [prep] a | 15 |
|
| 6 | have often been seen [prep] a | 5 |
|
| 7 | have often been see [prep] a | 5 |
|
