| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | more difficult [conj] | 315 |
|
| 2 | more difficult [subord] | 235 |
|
| 3 | more [adj] since | 50 |
|
| 4 | [adv] difficult since | 12 |
|
| 5 | [adv] difficult since | 11 |
|
| 6 | more difficult since | 8 |
|
| 7 | more difficult since | 8 |
|
