| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this has been [verb] | 590 |
|
| 2 | this has been [vb pp] | 562 |
|
| 3 | this has been do | 64 |
|
| 4 | this has been done | 64 |
|
| 5 | this has been achieved | 34 |
|
| 6 | this has been achieve | 34 |
|
| 7 | this has been [v-ing] | 21 |
|
| 8 | this has been confirmed | 12 |
|
| 9 | this has been taken | 12 |
|
| 10 | this has been confirm | 12 |
|
| 11 | this has been take | 12 |
|
| 12 | this has been discuss | 11 |
|
| 13 | this has been discussed | 11 |
|
| 14 | this has been use | 11 |
|
| 15 | this has been used | 11 |
|
| 16 | this has been going | 10 |
|
| 17 | this has been show | 10 |
|
| 18 | this has been go | 10 |
|
| 19 | this has been shown | 10 |
|
| 20 | this has been seen | 9 |
|
| 21 | this has been see | 9 |
|
| 22 | this has been described | 8 |
|
| 23 | this has been describe | 8 |
|
| 24 | this has been found | 7 |
|
| 25 | this has been brought | 7 |
|
| 26 | this has been bring | 7 |
|
| 27 | this has been find | 7 |
|
| 28 | this has been [to-vb] | 7 |
|
| 29 | this has been recognise | 6 |
|
| 30 | this has been demonstrated | 6 |
|
