| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb -s] not [be] [adj] | 113 |
|
| 2 | it [vb -s] [adv] [be] necessary | 9 |
|
| 3 | it [verb] not [be] necessary | 8 |
|
| 4 | [pron] [vb -s] not [be] necessary | 5 |
|
