| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it [be] necessary for | 16 |
|
| 2 | [verb] it be necessary for | 16 |
|
| 3 | [verb] it [is] necessary for | 12 |
|
| 4 | [verb] it 's necessary for | 7 |
|
| 5 | think it [be] necessary for | 7 |
|
| 6 | [vb infin] it [be] necessary for | 6 |
|
| 7 | [verb] it is necessary for | 5 |
|
| 8 | think it [be] necessary for | 5 |
|
