| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [verb] been shown to be | 10 |
|
| 2 | [noun prp] have [been] shown to be | 10 |
|
| 3 | [noun prp] [vb -s] [been] shown to be | 8 |
|
| 4 | [noun prp] has [been] shown to be | 8 |
|
