| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [adj] [noun] | 4065 |
|
| 2 | necessary [verb] [adj] [noun] | 499 |
|
| 3 | is necessary [verb] [adj] | 207 |
|
| 4 | is necessary [verb] [noun] | 146 |
|
