| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adj] whether | 563 |
|
| 2 | be [adj] whether | 561 |
|
| 3 | be doubtful [conj] | 331 |
|
| 4 | [be] doubtful whether | 175 |
|
| 5 | be doubtful whether | 175 |
|
