| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it is [adv] necessary [prep] | 9 |
|
| 2 | [coord] it is not necessary [prep] | 5 |
|
| 3 | [coord] it is not necessary [prep] | 5 |
|
| 4 | [coord] it is [not/n't] necessary [prep] | 5 |
|
| 5 | [coord] it is necessary [verb] [prep] | 7 |
|
| 6 | [coord] it is necessary [to-vb] [prep] | 7 |
|
