| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] be necessary [verb] [adj] [noun pl] | 7 |
|
| 2 | [adv] be necessary [to-vb] [adj] [noun pl] | 7 |
|
| 3 | [adv] be necessary [verb] [adj] [noun pl] | 7 |
|
