| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] be necessary for us [verb] | 11 |
|
| 2 | [pron] be necessary for us [to-vb] | 11 |
|
| 3 | it be necessary for us [verb] | 11 |
|
| 4 | it be necessary for us [verb] | 11 |
|
| 5 | [pron] is necessary for us [verb] | 9 |
|
