| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been shown [prep] be [vb pp] | 17 |
|
| 2 | have be shown to be [vb pp] | 17 |
|
| 3 | has be shown [prep] be [vb pp] | 11 |
|
| 4 | have be shown [prep] be [vb pp] | 6 |
|
