| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [subord] it is difficult [verb] | 5 |
|
| 2 | [conj] [subord] it is difficult [verb] | 5 |
|
| 3 | [coord] [subord] it is difficult [verb] | 5 |
|
| 4 | [conj] [subord] it is difficult [to-vb] | 5 |
|
