| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it [is] difficult [to-vb] | 98 |
|
| 2 | and it is difficult [to-vb] | 84 |
|
| 3 | and it [is] difficult to see | 23 |
|
| 4 | and it 's difficult [to-vb] | 14 |
|
| 5 | and it [is] difficult to know | 6 |
|
| 6 | and it [is] difficult to believe | 6 |
|
| 7 | and it [is] difficult to decide | 5 |
|
