| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adv] difficult [to-vb] [conj] [art] | 13 |
|
| 2 | [adv] [adv] difficult [to-vb] [conj] [art] | 11 |
|
| 3 | [adv] more difficult [to-vb] [conj] [art] | 10 |
|
| 4 | [adv] [adv] difficult [to-vb] [conj] the | 9 |
|
| 5 | [adv] [adv] difficult [to-vb] [conj] the | 9 |
|
| 6 | [adv] [adv] difficult [to-vb] [subord] [art] | 8 |
|
| 7 | [adv] [adv] difficult [to-vb] than [art] | 8 |
|
| 8 | [adv] [adv] difficult [to-vb] than [art] | 8 |
|
