| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] difficult [to-vb] [art] | 72 |
|
| 2 | [subord] it [is] difficult [to-vb] [art] | 23 |
|
| 3 | as it [is] [adj] [to-vb] [art] | 23 |
|
| 4 | as it [be] difficult [to-vb] [art] | 7 |
|
| 5 | as [pron] [is] difficult [to-vb] [art] | 6 |
|
| 6 | as it [is] difficult [verb] [art] | 6 |
|
| 7 | as it [is] difficult [to-vb] [art] | 6 |
|
