| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult for [pron] | 101 |
|
| 2 | it [vb mod] be difficult for | 80 |
|
| 3 | it [vb mod] be for [pron] | 56 |
|
| 4 | [vb mod] be difficult for [pron] | 42 |
|
