| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] necessary for | 66 |
|
| 2 | it is not necessary for | 40 |
|
| 3 | it is [not/n't] necessary for | 40 |
|
| 4 | it is not necessary for | 37 |
|
| 5 | it is [adv] necessary for | 26 |
|
| 6 | it is also necessary for | 5 |
|
| 7 | it is also necessary for | 5 |
|
