| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [verb] for | 275 |
|
| 2 | it is [vb pp] for | 204 |
|
| 3 | [pron] is required for | 27 |
|
| 4 | it is required [prep] | 21 |
|
| 5 | it [be] required for | 10 |
|
| 6 | it be required for | 10 |
|
| 7 | it is require for | 9 |
|
| 8 | it [is] required for | 9 |
|
