| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] [coord] [vb infin] | 50 |
|
| 2 | [adv] difficult [to-vb] and [verb] | 49 |
|
| 3 | more difficult [to-vb] [coord] [verb] | 21 |
|
| 4 | very difficult [to-vb] [coord] [verb] | 11 |
|
| 5 | [adv] difficult [to-vb] or [verb] | 9 |
|
