| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [is] necessary [to-vb] [det] | 8 |
|
| 2 | [conj] is necessary [verb] [det] | 8 |
|
| 3 | [subord] [is] necessary [verb] [det] | 7 |
|
| 4 | as [is] necessary [verb] [det] | 7 |
|
| 5 | as [is] necessary [verb] [det] | 7 |
|
| 6 | [conj] [is] necessary [verb] such | 5 |
|
| 7 | [conj] [is] necessary understand [det] | 5 |
|
| 8 | [conj] [is] necessary to understand [det] | 5 |
|
