| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been shown that | 136 |
|
| 2 | [vb -s] been shown that | 130 |
|
| 3 | has been shown that | 125 |
|
| 4 | had been shown that | 5 |
|
| 5 | [vb past] been shown that | 5 |
|
| 6 | 's been shown that | 5 |
|
