| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] whether [verb] | 21 |
|
| 2 | [vb pp] [prep] whether [to-vb] | 19 |
|
| 3 | [vb pp] on whether [verb] | 15 |
|
| 4 | [vb pp] on whether [verb] | 15 |
|
| 5 | [vb pp] about whether [verb] | 5 |
|
| 6 | [vb pp] about whether [verb] | 5 |
|
