| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] for [pron] [to-vb] | 57 |
|
| 2 | it [is] necessary for [pron] | 41 |
|
| 3 | [is] necessary for [pron] [to-vb] | 35 |
|
| 4 | it necessary for [pron] [to-vb] | 9 |
|
