| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] difficult [to-vb] [prep] | 32 |
|
| 2 | and difficult [to-vb] [prep] | 28 |
|
| 3 | and difficult [to-vb] [prep] | 28 |
|
| 4 | [conj] difficult [to-vb] with | 14 |
|
| 5 | [conj] difficult [to-vb] in | 11 |
|
| 6 | [subord] difficult [to-vb] [prep] | 9 |
|
| 7 | [conj] difficult [to-vb] at | 5 |
|
