| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has been [vb pp] that [noun] | 35 |
|
| 2 | it has [been] [vb pp] that [noun sg] | 35 |
|
| 3 | it has [been] suggested that [noun] | 7 |
|
| 4 | it has [been] reported that [noun] | 5 |
|
