| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] necessary [verb] [noun pl] | 58 |
|
| 2 | [is] [verb] such [noun pl] | 25 |
|
| 3 | necessary [verb] such [noun pl] | 13 |
|
| 4 | [is] necessary [verb] such | 10 |
|
