| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] proved to be | 14 |
|
| 2 | have [been] proved to be | 14 |
|
| 3 | [vb -s] [been] proved to be | 7 |
|
| 4 | has [been] proved to be | 7 |
|
| 5 | have [been] proved to be | 5 |
|
| 6 | [vb base] [been] proved to be | 5 |
|
