| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [verb] | 1529 |
|
| 2 | it is [adj] argue | 55 |
|
| 3 | it be difficult argue | 14 |
|
| 4 | it [be] difficult argue | 14 |
|
| 5 | [pron] is difficult argue | 13 |
|
| 6 | it [is] difficult argue | 13 |
|
