| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] because it is | 198 |
|
| 2 | difficult [conj] it is | 24 |
|
| 3 | difficult because it [be] | 10 |
|
| 4 | difficult because it be | 10 |
|
| 5 | difficult because it [is] | 9 |
|
| 6 | difficult because [pron] is | 8 |
|
