| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is necessary for us | 10 |
|
| 2 | it is necessary for us | 10 |
|
| 3 | it is necessary for us | 10 |
|
| 4 | [pers pn] is necessary for us | 10 |
|
| 5 | is necessary for us [verb] | 9 |
|
| 6 | is necessary for us [to-vb] | 9 |
|
