| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [verb] [noun] | 146 |
|
| 2 | is [verb] these [noun] | 92 |
|
| 3 | necessary [verb] these [noun] | 23 |
|
| 4 | is necessary [verb] these | 10 |
|
