| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [be] necessary [verb] two [noun pl] | 9 |
|
| 2 | [pers pn] [be] necessary [verb] two [noun pl] | 9 |
|
| 3 | it [be] necessary [verb] two [noun pl] | 9 |
|
| 4 | it [be] necessary [verb] two [noun pl] | 9 |
|
