| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [conj] [prep] | 61 |
|
| 2 | difficult [to-vb] [subord] [prep] | 44 |
|
| 3 | difficult [to-vb] because [prep] | 32 |
|
| 4 | difficult [to-vb] because [prep] | 32 |
|
| 5 | difficult [to-vb] [conj] of | 29 |
|
| 6 | difficult [to-vb] [coord] [prep] | 10 |
|
| 7 | difficult [to-vb] [conj] in | 9 |
|
| 8 | difficult [to-vb] [that] [prep] | 7 |
|
| 9 | difficult [to-vb] and [prep] | 7 |
|
| 10 | difficult [to-vb] and [prep] | 7 |
|
| 11 | difficult [to-vb] that [prep] | 7 |
|
| 12 | difficult [to-vb] that [prep] | 7 |
|
| 13 | difficult [to-vb] than [prep] | 5 |
|
| 14 | difficult [to-vb] than [prep] | 5 |
|
| 15 | difficult [to-vb] [conj] at | 5 |
|
