| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [to-vb] [conj] it [is] | 197 |
|
| 2 | difficult [to-vb] [conj] it [be] | 38 |
|
| 3 | difficult [to-vb] [conj] [pron] [is] | 37 |
|
| 4 | difficult [verb] [conj] it [is] | 21 |
|
