| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] to be a | 73 |
|
| 2 | been [vb pp] to [be] a | 73 |
|
| 3 | been [vb pp] to be a | 72 |
|
| 4 | been [vb pp] to [be] a | 72 |
|
| 5 | been [vb pp] to [be] a | 60 |
|
| 6 | been shown to [be] a | 23 |
|
| 7 | been [vb pp] to [be] an | 13 |
|
| 8 | been found to [be] a | 11 |
|
| 9 | been considered to [be] a | 7 |
|
| 10 | been held to [be] a | 5 |
|
