| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [vb pp] whether | 51 |
|
| 2 | it is [not/n't] [verb] whether | 51 |
|
| 3 | it is not [verb] whether | 51 |
|
| 4 | it is not [verb] whether | 50 |
|
| 5 | it is [adv] know whether | 48 |
|
| 6 | it is [adv] known whether | 47 |
|
