| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | thought have been [vb pp] [prep] a | 13 |
|
| 2 | thought have been [verb] [prep] a | 13 |
|
| 3 | thought to have been [verb] [prep] a | 13 |
|
| 4 | thought have been [verb] by a | 6 |
|
| 5 | thought have been [verb] by a | 6 |
|
