| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [to-vb] that [adj] | 13 |
|
| 2 | is necessary [verb] that [adj] | 13 |
|
| 3 | is necessary ensure that [adj] | 6 |
|
| 4 | is necessary [verb] that [det] | 6 |
|
| 5 | is necessary to ensure that [adj] | 6 |
|
| 6 | is necessary [verb] that [adj] | 5 |
|
