| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] necessary for the | 32 |
|
| 2 | it is not necessary for the | 17 |
|
| 3 | it is [not/n't] necessary for the | 17 |
|
| 4 | it is not necessary for the | 17 |
|
| 5 | it is [adv] necessary for the | 15 |
|
