| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] it is [prep] | 250 |
|
| 2 | difficult it be [prep] | 37 |
|
| 3 | difficult it [be] [prep] | 37 |
|
| 4 | difficult [pron] is [prep] | 26 |
|
| 5 | difficult it [is] [prep] | 26 |
|
