| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] [conj] [art] | 73 |
|
| 2 | more [adj] [to-vb] [conj] [art] | 73 |
|
| 3 | more [adj] [to-vb] [conj] [art] | 73 |
|
| 4 | more difficult [verb] [conj] [art] | 23 |
|
| 5 | more difficult [to-vb] [conj] [art] | 23 |
|
