| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] necessary [to-vb] | 460 |
|
| 2 | [coord] it is [adv] necessary | 59 |
|
| 3 | [coord] it is necessary [to-vb] | 47 |
|
| 4 | [coord] it is [adv] [to-vb] | 9 |
|
