| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] be doubtful whether | 166 |
|
| 2 | it [be] doubtful whether | 164 |
|
| 3 | [pers pn] [is] doubtful whether | 148 |
|
| 4 | [pers pn] is doubtful whether | 144 |
|
| 5 | [pers pn] [was/were] doubtful whether | 17 |
|
| 6 | [pers pn] was doubtful whether | 16 |
|
