| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [conj] [adj] [to-vb] [prep] | 326 |
|
| 2 | difficult [conj] [adj] [verb] [prep] | 11 |
|
| 3 | difficult [conj] [adj] [to-vb] [prep] | 9 |
|
| 4 | difficult [conj] [adj] [to-vb] [prep] | 9 |
|
