| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [adv] to | 31 |
|
| 2 | difficult [to-vb] [adv prt] to | 24 |
|
| 3 | difficult to get [adv] to | 10 |
|
| 4 | difficult [to-vb] [adv] to | 7 |
|
