| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] difficult [verb] | 1819 |
|
| 2 | it [is] [adj] argue | 57 |
|
| 3 | it [be] difficult argue | 14 |
|
| 4 | [pron] [is] difficult argue | 13 |
|
