| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be difficult for | 109 |
|
| 2 | [vb mod] be difficult for | 109 |
|
| 3 | would be difficult for | 34 |
|
| 4 | will be difficult for | 28 |
|
| 5 | may be difficult for | 22 |
|
| 6 | must be difficult for | 9 |
|
| 7 | can be difficult for | 8 |
|
| 8 | might be difficult for | 6 |
|
