| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adj] because [art] | 375 |
|
| 2 | be difficult [conj] [art] | 26 |
|
| 3 | be difficult [subord] [art] | 16 |
|
| 4 | be difficult because [art] | 8 |
|
| 5 | be difficult because [art] | 8 |
|
| 6 | [be] difficult because [art] | 8 |
|
