| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [to-vb] [adj] [noun] | 41 |
|
| 2 | [been] shown [to-vb] [adj] [noun] | 37 |
|
| 3 | has [been] shown [to-vb] [noun] | 30 |
|
| 4 | has [been] shown [to-vb] [adj] | 21 |
|
