| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] whether | 357 |
|
| 2 | is doubtful whether | 144 |
|
| 3 | is unclear whether | 45 |
|
| 4 | is uncertain whether | 38 |
|
| 5 | is questionable whether | 34 |
|
| 6 | is debatable whether | 26 |
|
| 7 | is immaterial whether | 11 |
|
| 8 | is true whether | 9 |
|
| 9 | is unknown whether | 6 |
|
| 10 | is unsure whether | 6 |
|
