| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] not necessary [to-vb] that | 13 |
|
| 2 | it be not necessary [verb] that | 13 |
|
| 3 | it [is] not necessary [verb] that | 12 |
|
| 4 | it is not necessary [verb] that | 12 |
|
