| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] doubtful if the [noun sg] | 10 |
|
| 2 | it [be] doubtful if the [noun sg] | 10 |
|
| 3 | [pers pn] [be] doubtful if the [noun sg] | 10 |
|
| 4 | [pron] [be] doubtful if the [noun sg] | 10 |
|
| 5 | [be] doubtful if the [noun sg] [vb mod] | 5 |
|
| 6 | [be] doubtful if the [noun sg] [modal v] | 5 |
|
