| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] [conj] [art] | 73 |
|
| 2 | very [adj] [to-vb] [conj] [art] | 55 |
|
| 3 | very [adj] [to-vb] [conj] [art] | 55 |
|
| 4 | very difficult [to-vb] [conj] [art] | 14 |
|
| 5 | very difficult [verb] [conj] [art] | 14 |
|
