| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [prep] [be] necessary | 6 |
|
| 2 | it [prep] be necessary | 6 |
|
| 3 | it to [be] necessary | 6 |
|
| 4 | it [prep] be necessary | 6 |
|
| 5 | it [prep] [be] necessary | 6 |
|
