| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | research have been do [prep] the | 10 |
|
| 2 | research [verb] been do [prep] the | 10 |
|
| 3 | research [verb] been do [prep] the | 10 |
|
| 4 | research [verb] been done [prep] the | 10 |
|
| 5 | research has been do [prep] the | 8 |
|
| 6 | research [vb -s] been do [prep] the | 8 |
|
| 7 | research [verb] been do on the | 7 |
|
| 8 | research [verb] been do on the | 7 |
|
