| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this study was [vb pp] | 60 |
|
| 2 | this study is [vb pp] | 19 |
|
| 3 | this study be designed | 19 |
|
| 4 | this study be carried | 12 |
|
| 5 | this study are [vb pp] | 8 |
|
| 6 | this study were [vb pp] | 7 |
|
| 7 | this study be performed | 5 |
|
