| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is necessary for [pron] [to-vb] | 25 |
|
| 2 | it is necessary for [pers pn] [to-vb] | 21 |
|
| 3 | it is necessary for we [to-vb] | 9 |
|
| 4 | it is necessary for us [to-vb] | 9 |
|
