| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] it [is] [prep] | 320 |
|
| 2 | difficult it [be] [prep] | 37 |
|
| 3 | difficult [pers pn] [is] [prep] | 26 |
|
| 4 | difficult [pron] [is] [prep] | 26 |
|
| 5 | difficult it [is] [prep] | 26 |
|
