| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [subord] it is [adj] [verb] | 59 |
|
| 2 | [conj] [conj] it is difficult [verb] | 11 |
|
| 3 | [conj] [subord] it [be] difficult [verb] | 8 |
|
| 4 | [conj] [subord] it be difficult [verb] | 8 |
|
| 5 | [conj] [subord] [pron] is difficult [verb] | 5 |
|
| 6 | [conj] [subord] it [is] difficult [verb] | 5 |
|
