| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [to-vb] [num] [noun pl] | 11 |
|
| 2 | is necessary [verb] [num] [noun pl] | 11 |
|
| 3 | is necessary [verb] two [noun pl] | 6 |
|
| 4 | is necessary [verb] three [noun pl] | 5 |
|
