| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] it [be] [prep] | 511 |
|
| 2 | difficult [pron] [be] [prep] | 37 |
|
| 3 | difficult [pers pn] [be] [prep] | 37 |
|
| 4 | difficult it [be] [prep] | 37 |
|
