| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult it [be] for | 31 |
|
| 2 | difficult it be for | 31 |
|
| 3 | difficult it is for | 22 |
|
| 4 | difficult it [is] for | 22 |
|
| 5 | difficult it [was/were] for | 9 |
|
| 6 | difficult it was for | 9 |
|
