| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | whether [pron] [verb] [to-vb] [coord] | 30 |
|
| 2 | know whether [pron] [verb] [to-vb] | 20 |
|
| 3 | know whether [pron] [verb] [coord] | 19 |
|
| 4 | know [pron] [verb] [to-vb] [coord] | 11 |
|
