| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | doubt as [prep] whether they | 5 |
|
| 2 | doubt [subord] [prep] whether they | 5 |
|
| 3 | doubt [subord] [prep] whether they | 5 |
|
| 4 | doubt [subord] to whether they | 5 |
|
| 5 | doubt [subord] to whether they | 5 |
|
