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