| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] whether [verb] a | 21 |
|
| 2 | [prep] whether [to-vb] a | 21 |
|
| 3 | on whether [verb] a | 8 |
|
| 4 | on whether [verb] a | 8 |
|
