| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] not necessary [to-vb] | 219 |
|
| 2 | it [be] necessary [to-vb] [prep] | 183 |
|
| 3 | it [be] not necessary [prep] | 80 |
|
| 4 | [be] not necessary [to-vb] [prep] | 20 |
|
| 5 | it [be] not [to-vb] [prep] | 17 |
|
