| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be necessary [verb] two [noun pl] | 9 |
|
| 2 | it be necessary [verb] two [noun] | 9 |
|
| 3 | it be necessary [to-vb] two [noun] | 9 |
|
| 4 | it is necessary [verb] two [noun] | 6 |
|
