| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] be difficult for | 80 |
|
| 2 | it [modal v] be difficult for | 80 |
|
| 3 | it [modal v] be difficult for | 80 |
|
| 4 | it would be difficult for | 26 |
|
| 5 | it would be difficult for | 26 |
|
| 6 | it will be difficult for | 20 |
|
| 7 | it will be difficult for | 20 |
|
| 8 | it may be difficult for | 19 |
|
| 9 | it may be difficult for | 19 |
|
| 10 | it must be difficult for | 6 |
|
| 11 | it must be difficult for | 6 |
|
