| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] necessary [verb] that | 54 |
|
| 2 | [is] necessary [to-vb] that | 53 |
|
| 3 | is necessary [verb] that | 51 |
|
| 4 | [is] necessary ensure that | 17 |
|
| 5 | [is] necessary to ensure that | 16 |
|
| 6 | [is] necessary to show that | 7 |
|
| 7 | [is] necessary show that | 7 |
|
