| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it is [adj] [verb] [art] | 256 |
|
| 2 | [conj] it is difficult [verb] [art] | 69 |
|
| 3 | [subord] it [be] difficult [verb] [art] | 27 |
|
| 4 | [subord] it be difficult [verb] [art] | 27 |
|
| 5 | [subord] it [is] difficult [verb] [art] | 23 |
|
| 6 | [subord] it is difficult [verb] [art] | 22 |
|
| 7 | [subord] [pron] is difficult [verb] [art] | 22 |
|
