| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it [is] [adj] whether | 66 |
|
| 2 | [coord] it [is] doubtful [conj] | 52 |
|
| 3 | [conj] it [is] doubtful whether | 43 |
|
| 4 | [coord] it [be] doubtful whether | 33 |
|
| 5 | [coord] [pers pn] [is] doubtful whether | 32 |
|
| 6 | [coord] [pron] [is] doubtful whether | 32 |
|
| 7 | [coord] it [is] doubtful whether | 32 |
|
