| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [not/n't] necessary | 274 |
|
| 2 | it is [not/n't] that | 125 |
|
| 3 | it is necessary that | 41 |
|
| 4 | is [not/n't] necessary that | 7 |
|
