| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | necessary [to-vb] [adj] [noun] | 488 |
|
| 2 | it [to-vb] [adj] [noun] | 184 |
|
| 3 | it necessary [to-vb] [adj] | 55 |
|
| 4 | it necessary [to-vb] [noun] | 45 |
|
