| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary [to-vb] that [adj] [noun pl] | 10 |
|
| 2 | is necessary [to-vb] that [adj] [noun pl] | 6 |
|
| 3 | be necessary to ensure that [adj] [noun pl] | 6 |
|
| 4 | be necessary [to-vb] that [adj] [noun pl] | 5 |
|
