| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been shown to be [art] | 20 |
|
| 2 | have been shown to be [art] | 20 |
|
| 3 | has been shown to be [art] | 17 |
|
| 4 | [vb -s] been shown to be [art] | 17 |
|
| 5 | [verb] been shown to be a | 14 |
|
| 6 | [verb] been shown to be a | 11 |
|
