| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] necessary [prep] us | 11 |
|
| 2 | it [is] necessary for us | 11 |
|
| 3 | it [is] necessary for us | 11 |
|
| 4 | it is necessary [prep] us | 10 |
|
