| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] necessary [verb] | 461 |
|
| 2 | and it is [adv] [verb] | 275 |
|
| 3 | and it is [adv] necessary | 33 |
|
| 4 | and it is necessary [verb] | 23 |
|
