| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] necessary [verb] | 286 |
|
| 2 | [noun] it is [adv] [verb] | 206 |
|
| 3 | [noun] it is necessary [verb] | 175 |
|
| 4 | [noun] it is [adv] necessary | 34 |
|
| 5 | [noun] is [adv] necessary [verb] | 19 |
|
