| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary [to-vb] [adj] [noun pl] | 63 |
|
| 2 | is necessary [verb] [adj] [noun pl] | 29 |
|
| 3 | be necessary [verb] [adj] [noun pl] | 22 |
|
| 4 | be necessary [verb] new [noun pl] | 6 |
|
| 5 | be necessary [verb] certain [noun pl] | 6 |
|
