| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [to-vb] is [conj] | 35 |
|
| 2 | difficult [to-vb] be [conj] | 7 |
|
| 3 | difficult [to-vb] [is] [conj] | 7 |
|
| 4 | difficult [to-vb] [be] [conj] | 7 |
|
| 5 | difficult [verb] is [conj] | 7 |
|
