| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | doubt whether [pron] [modal v] [verb] | 50 |
|
| 2 | i doubt [pron] [modal v] [verb] | 44 |
|
| 3 | i doubt whether [pron] [modal v] | 36 |
|
| 4 | i doubt whether [pron] [verb] | 12 |
|
| 5 | i whether [pron] [modal v] [verb] | 8 |
|
