| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult to achieve | 86 |
|
| 2 | [adv] difficult to achieve | 83 |
|
| 3 | be difficult to achieve | 54 |
|
| 4 | [be] difficult to achieve | 54 |
|
| 5 | more difficult to achieve | 28 |
|
| 6 | more difficult to achieve | 28 |
|
| 7 | [is] difficult to achieve | 23 |
|
| 8 | is difficult to achieve | 22 |
|
| 9 | very difficult to achieve | 18 |
|
| 10 | very difficult to achieve | 18 |
|
| 11 | [be] difficult to achieve | 12 |
|
| 12 | be difficult to achieve | 12 |
|
| 13 | [noun] difficult to achieve | 10 |
|
| 14 | [noun sg] difficult to achieve | 9 |
|
| 15 | [am/are] difficult to achieve | 7 |
|
| 16 | [verb] difficult to achieve | 7 |
|
| 17 | are difficult to achieve | 7 |
|
| 18 | [been] difficult to achieve | 7 |
|
| 19 | been difficult to achieve | 7 |
|
| 20 | most difficult to achieve | 6 |
|
| 21 | most difficult to achieve | 6 |
|
| 22 | so difficult to achieve | 5 |
|
| 23 | extremely difficult to achieve | 5 |
|
| 24 | [was/were] difficult to achieve | 5 |
|
| 25 | so difficult to achieve | 5 |
|
| 26 | extremely difficult to achieve | 5 |
|
| 27 | difficult [noun] to achieve | 5 |
|
| 28 | difficult [noun sg] to achieve | 5 |
|
| 29 | difficult to achieve [prep] | 34 |
|
| 30 | difficult to achieve [prep] | 34 |
|
