| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adj] [to-vb] [adv] | 3377 |
|
| 2 | [adv] [adj] [to-vb] [adv] | 3135 |
|
| 3 | [adv] difficult [to-vb] [adv] | 405 |
|
| 4 | [adv] difficult [verb] [adv] | 355 |
|
| 5 | [adv] difficult [to-vb] [adv] | 351 |
|
