| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] whether [verb] | 276 |
|
| 2 | [prep] whether [to-vb] | 254 |
|
| 3 | [prep] [subord] to allow | 9 |
|
| 4 | [prep] [conj] to allow | 9 |
|
| 5 | [prep] whether allow | 8 |
|
| 6 | [prep] whether to allow | 8 |
|
