| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this study [be] [to-vb] whether | 11 |
|
| 2 | [det] study [be] [to-vb] whether | 11 |
|
| 3 | [det] study be [to-vb] whether | 11 |
|
| 4 | [det] study [was/were] [to-vb] whether | 9 |
|
| 5 | [det] study was [to-vb] whether | 9 |
|
| 6 | [det] study [be] to determine whether | 5 |
|
