| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] necessary [verb] | 340 |
|
| 2 | it [be] [adv] [verb] it | 57 |
|
| 3 | it [be] necessary [verb] it | 18 |
|
| 4 | [be] [adv] necessary [verb] it | 6 |
|
