| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary is [conj] | 10 |
|
| 2 | [be] necessary is [conj] | 10 |
|
| 3 | [is] necessary is [conj] | 9 |
|
| 4 | is necessary is [conj] | 8 |
|
