| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [to-vb] [art] | 331 |
|
| 2 | it is difficult [to-vb] the | 239 |
|
| 3 | it is difficult [to-vb] a | 77 |
|
| 4 | it is difficult to avoid [art] | 22 |
|
| 5 | it is difficult to assess [art] | 21 |
|
| 6 | it is difficult to imagine [art] | 21 |
|
| 7 | it is difficult [to-vb] an | 15 |
|
| 8 | it is difficult to find [art] | 10 |
|
| 9 | it is difficult to determine [art] | 9 |
|
| 10 | it is difficult to identify [art] | 9 |
|
| 11 | it is difficult to see [art] | 9 |
|
| 12 | it is difficult to get [art] | 8 |
|
| 13 | it is difficult to escape [art] | 8 |
|
| 14 | it is difficult to make [art] | 7 |
|
| 15 | it is difficult to resist [art] | 7 |
|
| 16 | it is difficult to separate [art] | 6 |
|
| 17 | it is difficult to compare [art] | 5 |
|
| 18 | it is difficult to establish [art] | 5 |
|
| 19 | it is difficult to understand [art] | 5 |
|
| 20 | it is difficult to judge [art] | 5 |
|
