| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [adv] [noun sg] | 24 |
|
| 2 | difficult [verb] [Wh adv] [noun sg] | 13 |
|
| 3 | difficult [verb] how [noun sg] | 11 |
|
| 4 | difficult [verb] how [noun sg] | 11 |
|
| 5 | difficult [verb] [adv prt] [noun sg] | 9 |
|
| 6 | difficult see [adv] [noun sg] | 9 |
|
| 7 | difficult to see [adv] [noun sg] | 9 |
|
