| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] whether [pron] [modal v] | 977 |
|
| 2 | [vb past] [verb] [pron] [modal v] | 898 |
|
| 3 | [vb past] whether [pron] [modal v] | 143 |
|
| 4 | [vb past] [verb] whether [pron] | 93 |
|
