| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [verb] | 1529 |
|
| 2 | it is [adj] know | 244 |
|
| 3 | it be difficult know | 105 |
|
| 4 | it [be] difficult know | 105 |
|
| 5 | it [is] difficult know | 88 |
|
| 6 | it is difficult know | 63 |
|
| 7 | [pers pn] is difficult know | 63 |
|
| 8 | [pron] is difficult know | 63 |
|
