| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] [adv] difficult [to-vb] | 300 |
|
| 2 | [be] [adv] [adv] difficult [to-vb] | 300 |
|
| 3 | [is] [adv] [adv] difficult [to-vb] | 190 |
|
| 4 | is [adv] [adv] difficult [to-vb] | 173 |
|
| 5 | [am/are] [adv] [adv] difficult [to-vb] | 60 |
|
| 6 | are [adv] [adv] difficult [to-vb] | 58 |
|
| 7 | [pron] [adv] [adv] difficult [to-vb] | 36 |
|
| 8 | [pers pn] [adv] [adv] difficult [to-vb] | 35 |
|
| 9 | it [adv] [adv] difficult [to-vb] | 33 |
|
| 10 | [adv] [adv] [adv] difficult [to-vb] | 33 |
|
| 11 | it [adv] [adv] difficult [to-vb] | 33 |
|
| 12 | [adv] [adv] [adv] difficult [to-vb] | 29 |
|
| 13 | [was/were] [adv] [adv] difficult [to-vb] | 29 |
|
| 14 | [conj] [adv] [adv] difficult [to-vb] | 28 |
|
| 15 | [coord] [adv] [adv] difficult [to-vb] | 28 |
|
| 16 | [verb] [adv] [adv] difficult [to-vb] | 25 |
|
| 17 | was [adv] [adv] difficult [to-vb] | 24 |
|
| 18 | and [adv] [adv] difficult [to-vb] | 22 |
|
| 19 | and [adv] [adv] difficult [to-vb] | 22 |
|
| 20 | become [adv] [adv] difficult [to-vb] | 18 |
|
| 21 | 's [adv] [adv] difficult [to-vb] | 17 |
|
| 22 | be [adv] [adv] difficult [to-vb] | 17 |
|
| 23 | [be] [adv] [adv] difficult [to-vb] | 17 |
|
| 24 | [noun] [adv] [adv] difficult [to-vb] | 10 |
|
| 25 | [art] [adv] [adv] difficult [to-vb] | 8 |
|
| 26 | [art] [adv] [adv] difficult [to-vb] | 8 |
|
| 27 | [vb past] [adv] [adv] difficult [to-vb] | 7 |
|
| 28 | [vb -s] [adv] [adv] difficult [to-vb] | 7 |
|
| 29 | a [adv] [adv] difficult [to-vb] | 7 |
|
| 30 | a [adv] [adv] difficult [to-vb] | 7 |
|
