| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [been] shown to be [vb pp] | 11 |
|
| 2 | [vb -s] be shown to be [vb pp] | 11 |
|
| 3 | has [be] shown to be [vb pp] | 11 |
|
| 4 | [vb -s] been shown to be [vb pp] | 11 |
|
