| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] [adj] [verb] | 5804 |
|
| 2 | it [is] [adv] necessary [verb] | 479 |
|
| 3 | it [be] [adv] necessary [verb] | 340 |
|
| 4 | [pron] [is] [adv] necessary [verb] | 300 |
|
