| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is [adv] difficult to achieve | 10 |
|
| 2 | it is [adv] difficult to achieve | 6 |
|
| 3 | it is [adv] difficult to achieve | 6 |
|
| 4 | [pers pn] is [adv] difficult to achieve | 6 |
|
| 5 | [adj] is [adv] difficult to achieve | 5 |
|
| 6 | is [adv] [adv] difficult to achieve | 5 |
|
| 7 | is [adv] difficult to achieve [prep] | 6 |
|
| 8 | is [adv] difficult to achieve [prep] | 6 |
|
