| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] [coord] | 136 |
|
| 2 | [adv] difficult [verb] and | 109 |
|
| 3 | more difficult [verb] [coord] | 41 |
|
| 4 | very difficult [verb] [coord] | 24 |
|
| 5 | [adv] difficult [verb] or | 15 |
|
| 6 | [adv] difficult [verb] but | 12 |
|
| 7 | extremely difficult [verb] [coord] | 11 |
|
| 8 | [adv] difficult understand [coord] | 8 |
|
| 9 | [adv] difficult to understand [coord] | 8 |
|
| 10 | notoriously difficult [verb] [coord] | 7 |
|
| 11 | most difficult [verb] [coord] | 6 |
|
| 12 | [adv] difficult control [coord] | 5 |
|
| 13 | [adv] difficult to control [coord] | 5 |
|
| 14 | so difficult [verb] [coord] | 5 |
|
| 15 | [adv] difficult obtain [coord] | 5 |
|
| 16 | [adv] difficult to obtain [coord] | 5 |
|
