| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] necessary on [adj] [noun] | 6 |
|
| 2 | be necessary on [adj] [noun] | 6 |
|
| 3 | necessary [verb] on [adj] [noun] | 7 |
|
| 4 | necessary [to-vb] on [adj] [noun] | 6 |
|
| 5 | necessary on [art] [adj] [noun] | 5 |
|
| 6 | necessary on [art] [adj] [noun] | 5 |
|
| 7 | necessary on [adj] [noun] [conj] | 5 |
|
