| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] whether [verb] | 792 |
|
| 2 | [vb infin] whether [verb] | 206 |
|
| 3 | know [conj] [verb] | 205 |
|
| 4 | know whether [verb] | 102 |
|
