| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it necessary for [noun pl] | 5 |
|
| 2 | it [be] necessary for [noun pl] | 9 |
|
| 3 | it be necessary for [noun pl] | 9 |
|
| 4 | it was necessary for [noun pl] | 5 |
|
| 5 | it [was/were] necessary for [noun pl] | 5 |
|
