| No | Pattern | Freq | Relations |
|---|---|---|---|
| 31 | [prep] be [adv] difficult [to-vb] | 34 |
|
| 32 | [prep] be [adv] difficult [verb] | 34 |
|
| 33 | [prep] be [adv] difficult [prep] | 19 |
|
| 34 | [prep] be [adv] difficult [prep] | 19 |
|
| 35 | [prep] be [adv] difficult [conj] | 14 |
|
| 36 | [prep] be [adv] difficult for | 14 |
|
| 37 | [prep] be [adv] difficult for | 14 |
|
| 38 | [prep] be [adv] difficult [subord] | 10 |
|
