| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it 's [not/n't] [vb pp] if | 6 |
|
| 2 | it 's not [verb] if | 6 |
|
| 3 | it 's [not/n't] known if | 5 |
|
| 4 | it 's [not/n't] know if | 5 |
|
