| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] for | 2028 |
|
| 2 | it [be] difficult for | 228 |
|
| 3 | it be difficult for | 228 |
|
| 4 | it is difficult [prep] | 218 |
|
| 5 | it [is] difficult for | 169 |
|
| 6 | [pron] is difficult for | 145 |
|
