| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult for [noun] | 28 |
|
| 2 | it [is] difficult for [noun pl] | 21 |
|
| 3 | it [is] difficult for people | 8 |
|
| 4 | it [is] difficult for [n mass] | 8 |
|
| 5 | it [is] difficult for people | 8 |
|
| 6 | it 's difficult for [noun] | 5 |
|
