| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] it is | 2388 |
|
| 2 | difficult it [be] | 158 |
|
| 3 | difficult it be | 158 |
|
| 4 | difficult it [is] | 116 |
|
| 5 | difficult [pron] is | 116 |
|
