| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [not/n't] [verb] | 697 |
|
| 2 | [conj] it [is] necessary [verb] | 186 |
|
| 3 | it [is] [not/n't] necessary [verb] | 183 |
|
| 4 | [conj] it [is] [not/n't] necessary | 77 |
|
