| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] necessary [to-vb] [noun] | 113 |
|
| 2 | [is] necessary [to-vb] [adj] [noun] | 63 |
|
| 3 | it [is] necessary [to-vb] [adj] | 62 |
|
| 4 | it [is] [to-vb] [adj] [noun] | 35 |
|
| 5 | it necessary [to-vb] [adj] [noun] | 14 |
|
