| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult to do | 75 |
|
| 2 | [adv] difficult to do | 70 |
|
| 3 | very difficult to do | 33 |
|
| 4 | very difficult to do | 33 |
|
| 5 | [be] difficult to do | 25 |
|
| 6 | be difficult to do | 25 |
|
| 7 | [is] difficult to do | 14 |
|
| 8 | it difficult to do | 11 |
|
| 9 | it difficult to do | 11 |
|
| 10 | [pers pn] difficult to do | 11 |
|
| 11 | [pron] difficult to do | 11 |
|
| 12 | more difficult to do | 9 |
|
| 13 | more difficult to do | 9 |
|
| 14 | is difficult to do | 9 |
|
| 15 | quite difficult to do | 9 |
|
| 16 | quite difficult to do | 9 |
|
| 17 | extremely difficult to do | 6 |
|
| 18 | [was/were] difficult to do | 6 |
|
| 19 | extremely difficult to do | 6 |
|
| 20 | [not/n't] difficult to do | 5 |
|
| 21 | not difficult to do | 5 |
|
| 22 | 's difficult to do | 5 |
|
| 23 | was difficult to do | 5 |
|
| 24 | difficult [noun] to do | 23 |
|
| 25 | difficult [noun sg] to do | 22 |
|
| 26 | difficult thing to do | 17 |
|
| 27 | difficult thing to do | 16 |
|
| 28 | difficult to do [conj] | 21 |
|
| 29 | difficult to do [subord] | 17 |
|
| 30 | difficult to do [det] | 16 |
|
