| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [adj] [noun pl] | 1497 |
|
| 2 | necessary [verb] [adj] [noun pl] | 215 |
|
| 3 | is necessary [verb] [adj] | 207 |
|
| 4 | is necessary [verb] [noun pl] | 56 |
|
