| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been shown that [det] | 11 |
|
| 2 | has been shown that [det] | 11 |
|
| 3 | [vb -s] been shown that [det] | 11 |
|
| 4 | have been shown that [det] | 11 |
|
