| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be necessary [to-vb] | 1382 |
|
| 2 | it be n't necessary | 52 |
|
| 3 | it be n't [to-vb] | 18 |
|
| 4 | be n't necessary [to-vb] | 18 |
|
