| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | believe have been [vb pp] [prep] a | 10 |
|
| 2 | believe have been [verb] [prep] a | 10 |
|
| 3 | believe to have been [verb] [prep] a | 9 |
|
| 4 | believed have been [verb] [prep] a | 6 |
|
