| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [coord] [adv] | 37 |
|
| 2 | difficult [to-vb] and [adv] | 27 |
|
| 3 | difficult [to-vb] and [adv] | 27 |
|
| 4 | difficult [to-vb] [subord] [adv] | 13 |
|
| 5 | difficult [to-vb] [conj] even | 12 |
|
| 6 | difficult [to-vb] than [adv] | 7 |
|
| 7 | difficult [to-vb] but [adv] | 7 |
|
| 8 | difficult [to-vb] than [adv] | 7 |
|
| 9 | difficult [to-vb] but [adv] | 7 |
|
| 10 | difficult [to-vb] that [adv] | 6 |
|
| 11 | difficult [to-vb] that [adv] | 6 |
|
| 12 | difficult [to-vb] [that] [adv] | 6 |
|
