| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] necessary | 384 |
|
| 2 | it is necessary for | 104 |
|
| 3 | it is [adv] for | 77 |
|
| 4 | is [adv] necessary for | 60 |
|
| 5 | it [adv] necessary for | 8 |
|
