| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb -s] [be] [adj] | 832 |
|
| 2 | it [vb -s] [be] [adj] | 659 |
|
| 3 | it [verb] [be] necessary | 48 |
|
| 4 | [pron] [vb -s] [be] necessary | 36 |
|
| 5 | it [vb -s] [be] necessary | 34 |
|
