| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [to-vb] [conj] [adv] | 560 |
|
| 2 | difficult [to-vb] [conj] [adv] | 59 |
|
| 3 | difficult [verb] [conj] [adv] | 56 |
|
