| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] necessary see [adv] | 7 |
|
| 2 | be necessary see [adv] | 7 |
|
| 3 | [is] necessary see [adv] | 5 |
|
| 4 | is necessary see [adv] | 5 |
|
