| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary for [adj] | 137 |
|
| 2 | [conj] be necessary for | 49 |
|
| 3 | [conj] be for [adj] | 31 |
|
| 4 | [conj] necessary for [adj] | 14 |
|
