| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is necessary [verb] [noun] | 111 |
|
| 2 | it is [verb] this [noun] | 16 |
|
| 3 | it is necessary [verb] this | 13 |
|
| 4 | is necessary [verb] this [noun] | 7 |
|
