| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary for this | 14 |
|
| 2 | [be] necessary for this | 14 |
|
| 3 | [noun] necessary for this | 6 |
|
| 4 | necessary for this [noun] | 16 |
|
| 5 | necessary for this [noun sg] | 16 |
|
