| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] it necessary [to-vb] | 67 |
|
| 2 | it necessary [to-vb] [noun] | 45 |
|
| 3 | [vb infin] it [to-vb] [noun] | 44 |
|
| 4 | [vb infin] necessary [to-vb] [noun] | 5 |
|
