| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | question [prep] whether [verb] | 17 |
|
| 2 | question of whether [verb] | 16 |
|
| 3 | question [prep] whether [verb] | 16 |
|
| 4 | question of whether [verb] | 16 |
|
| 5 | question [prep] whether [to-vb] | 14 |
|
