| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] necessary [verb] | 314 |
|
| 2 | is [adv] not [verb] | 274 |
|
| 3 | is not necessary [verb] | 182 |
|
| 4 | is [adv] not necessary | 13 |
|
| 5 | [adv] not necessary [verb] | 8 |
|
