| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] [coord] | 140 |
|
| 2 | [adv] difficult [verb] [coord] | 136 |
|
| 3 | [adv] difficult [verb] and | 112 |
|
| 4 | more difficult [verb] [coord] | 41 |
|
| 5 | more difficult [verb] [coord] | 41 |
|
| 6 | very difficult [verb] [coord] | 24 |
|
| 7 | very difficult [verb] [coord] | 24 |
|
| 8 | [adv] difficult [verb] or | 15 |
|
| 9 | [adv] difficult [verb] but | 13 |
|
| 10 | extremely difficult [verb] [coord] | 11 |
|
| 11 | extremely difficult [verb] [coord] | 11 |
|
| 12 | [adv] difficult understand [coord] | 8 |
|
| 13 | [adv] difficult to understand [coord] | 8 |
|
| 14 | notoriously difficult [verb] [coord] | 7 |
|
| 15 | notoriously difficult [verb] [coord] | 7 |
|
| 16 | most difficult [verb] [coord] | 6 |
|
| 17 | most difficult [verb] [coord] | 6 |
|
| 18 | [adv] difficult control [coord] | 5 |
|
| 19 | so difficult [verb] [coord] | 5 |
|
| 20 | [adv] difficult obtain [coord] | 5 |
|
| 21 | so difficult [verb] [coord] | 5 |
|
| 22 | [adv] difficult to control [coord] | 5 |
|
| 23 | [adv] difficult to obtain [coord] | 5 |
|
