| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is necessary [to-vb] that | 43 |
|
| 2 | it is necessary [verb] that | 43 |
|
| 3 | it is necessary [verb] that | 43 |
|
| 4 | it is necessary ensure that | 9 |
|
| 5 | it is necessary to ensure that | 9 |
|
| 6 | it is necessary show that | 7 |
|
| 7 | it is necessary to show that | 7 |
|
