| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary [to-vb] these [noun pl] | 11 |
|
| 2 | be necessary [verb] these [noun pl] | 11 |
|
| 3 | be necessary [verb] these [noun pl] | 11 |
|
| 4 | is necessary [verb] these [noun pl] | 8 |
|
