| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it have previously been | 9 |
|
| 2 | [conj] it have previously been | 9 |
|
| 3 | where it have previously been | 6 |
|
| 4 | where it have previously been | 6 |
|
| 5 | it have previously been [verb] | 23 |
|
| 6 | it have previously been [vb pp] | 23 |
|
| 7 | it have previously been show | 5 |
|
| 8 | it have previously been shown | 5 |
|
