| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [verb] [coord] [verb] | 59 |
|
| 2 | [adv] difficult [to-vb] [coord] [verb] | 59 |
|
| 3 | [adv] difficult [verb] [coord] [vb infin] | 50 |
|
| 4 | [adv] difficult [verb] and [verb] | 49 |
|
| 5 | more difficult [verb] [coord] [verb] | 21 |
|
| 6 | very difficult [verb] [coord] [verb] | 11 |
|
| 7 | [adv] difficult [verb] or [verb] | 9 |
|
