| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [num] [noun] | 486 |
|
| 2 | is necessary [verb] [noun] | 146 |
|
| 3 | necessary [verb] [num] [noun] | 25 |
|
| 4 | is necessary [verb] [num] | 18 |
|
