| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] be difficult because [prep] | 11 |
|
| 2 | [noun pl] be difficult because [prep] | 7 |
|
| 3 | be [adv] difficult because [prep] | 11 |
|
| 4 | be [adv] difficult because [prep] | 10 |
|
| 5 | be difficult [to-vb] because [prep] | 15 |
|
| 6 | be difficult [verb] because [prep] | 15 |
|
| 7 | be difficult because [prep] [art] | 10 |
|
| 8 | be difficult because [prep] the | 10 |
|
| 9 | be difficult because [prep] the | 10 |
|
| 10 | be difficult because [prep] [art] | 10 |
|
| 11 | be difficult because [prep] [adj] | 5 |
|
| 12 | be difficult because [prep] [noun] | 5 |
|
