| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] it is [adv] | 1546 |
|
| 2 | it is [adv] necessary | 384 |
|
| 3 | [noun] it is necessary | 223 |
|
| 4 | [noun] is [adv] necessary | 142 |
|
