| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary for [noun sg] | 74 |
|
| 2 | be for [noun sg] [verb] | 70 |
|
| 3 | be necessary for [verb] | 23 |
|
| 4 | necessary for [noun sg] [verb] | 16 |
|
