| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [adv] | 6020 |
|
| 2 | it is [adv] necessary | 659 |
|
| 3 | it is [adv] necessary | 384 |
|
| 4 | is [adv] [adv] necessary | 124 |
|
