| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] necessary [prep] he | 8 |
|
| 2 | it [be] [not/n't] necessary [prep] he | 6 |
|
| 3 | it [be] not necessary [prep] he | 6 |
|
| 4 | it [be] necessary [prep] he [to-vb] | 9 |
|
| 5 | it [be] necessary [prep] he [verb] | 9 |
|
