| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is necessary [to-vb] [adj] | 162 |
|
| 2 | it is necessary [to-vb] that | 43 |
|
| 3 | is necessary [to-vb] that [adj] | 13 |
|
| 4 | it is [to-vb] that [adj] | 5 |
|
