| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [to-vb] [coord] [verb] | 796 |
|
| 2 | difficult [to-vb] [coord] [verb] | 141 |
|
| 3 | [adv] difficult [to-vb] [coord] | 136 |
|
| 4 | [adv] difficult [to-vb] [verb] | 40 |
|
| 5 | [adv] difficult [coord] [verb] | 31 |
|
