| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it is [adj] whether | 63 |
|
| 2 | [coord] it is doubtful [conj] | 50 |
|
| 3 | [conj] it is doubtful whether | 41 |
|
| 4 | [coord] it [be] doubtful whether | 33 |
|
| 5 | [coord] it be doubtful whether | 33 |
|
| 6 | [coord] it [is] doubtful whether | 32 |
|
| 7 | [coord] it is doubtful whether | 30 |
|
| 8 | [coord] [pers pn] is doubtful whether | 30 |
|
| 9 | [coord] [pron] is doubtful whether | 30 |
|
