| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [verb] | 1529 |
|
| 2 | it is [adj] assess | 73 |
|
| 3 | it [be] difficult assess | 43 |
|
| 4 | it be difficult assess | 43 |
|
| 5 | it [is] difficult assess | 41 |
|
| 6 | [pron] is difficult assess | 40 |
|
| 7 | it is difficult assess | 40 |
|
| 8 | [pers pn] is difficult assess | 40 |
|
