| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | very difficult [to-vb] [coord] [verb] | 11 |
|
| 2 | very difficult [verb] [coord] [verb] | 11 |
|
| 3 | very difficult [verb] [coord] [vb infin] | 10 |
|
| 4 | very difficult [verb] and [verb] | 8 |
|
