| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it [be] often necessary [verb] | 5 |
|
| 2 | [coord] it be often necessary [verb] | 5 |
|
| 3 | [coord] it [be] often necessary [verb] | 5 |
|
| 4 | [coord] it [be] often necessary [to-vb] | 5 |
|
