| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been prove to [be] | 10 |
|
| 2 | has [been] prove to [be] | 10 |
|
| 3 | [vb -s] [been] prove to be | 10 |
|
| 4 | [vb -s] [been] proved to [be] | 7 |
|
