| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] been shown to be [adv] | 19 |
|
| 2 | [vb base] [been] shown to be [adv] | 19 |
|
| 3 | have [be] shown to be [adv] | 19 |
|
| 4 | [vb base] be shown to be [adv] | 19 |
|
