| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary [verb] [adj] [noun pl] | 121 |
|
| 2 | be necessary [to-vb] [adj] [noun pl] | 121 |
|
| 3 | be necessary to understand [adj] [noun] | 8 |
|
| 4 | be [adj] to understand [adj] [noun pl] | 7 |
|
| 5 | be necessary understand [adj] [noun pl] | 6 |
|
| 6 | [be] necessary to understand [adj] [noun pl] | 6 |
|
