| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] thought to have been a | 12 |
|
| 2 | be thought [to-vb] been a | 12 |
|
| 3 | is thought [to-vb] been a | 9 |
|
| 4 | [is] thought [to-vb] been a | 9 |
|
