| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it is difficult [verb] | 377 |
|
| 2 | [subord] it is difficult [verb] | 120 |
|
| 3 | because it is [adj] [verb] | 86 |
|
| 4 | because it be difficult [verb] | 21 |
|
| 5 | because it [be] difficult [verb] | 21 |
|
| 6 | because it [is] difficult [verb] | 18 |
|
| 7 | because it is difficult [verb] | 17 |
|
| 8 | because [pron] is difficult [verb] | 17 |
|
| 9 | because [pers pn] is difficult [verb] | 17 |
|
| 10 | because it is difficult [verb] | 17 |
|
