| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] it [be] | 6542 |
|
| 2 | [adj] it [be] | 3626 |
|
| 3 | difficult [pron] [be] | 165 |
|
| 4 | difficult [pers pn] [be] | 162 |
|
| 5 | difficult it [be] | 158 |
|
| 6 | difficult it [be] | 158 |
|
