| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [coord] [verb] | 141 |
|
| 2 | very difficult [to-vb] [coord] | 24 |
|
| 3 | very difficult [to-vb] [verb] | 12 |
|
| 4 | very difficult [coord] [verb] | 5 |
|
