| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [been] difficult for | 20 |
|
| 2 | [modal v] have be difficult for | 20 |
|
| 3 | [modal v] have [be] difficult for | 20 |
|
| 4 | [modal v] have been difficult for | 20 |
|
| 5 | [vb mod] have [be] difficult for | 20 |
|
| 6 | would have [be] difficult for | 14 |
|
| 7 | would have [be] difficult for | 14 |
|
