| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [verb] | 4626 |
|
| 2 | it is necessary [verb] | 1050 |
|
| 3 | it is [adv] necessary | 384 |
|
| 4 | is [adv] necessary [verb] | 314 |
|
| 5 | it [adv] necessary [verb] | 7 |
|
