| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] for [noun] | 218 |
|
| 2 | is [adv] necessary for | 118 |
|
| 3 | is necessary for [noun] | 46 |
|
| 4 | [adv] necessary for [noun] | 46 |
|
