| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] [verb] | 10522 |
|
| 2 | it be necessary [verb] | 1382 |
|
| 3 | it be [adv] necessary | 490 |
|
| 4 | be [adv] necessary [verb] | 400 |
|
| 5 | it [adv] necessary [verb] | 7 |
|
