| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [verb] that [adj] [noun pl] | 6 |
|
| 2 | [is] necessary [to-vb] that [adj] [noun pl] | 6 |
|
| 3 | [is] necessary [verb] that [adj] [noun pl] | 6 |
|
