| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult believe that [det] | 10 |
|
| 2 | it [be] difficult to believe that [det] | 10 |
|
| 3 | it [is] difficult believe that [det] | 6 |
|
| 4 | it is difficult believe that [det] | 6 |
|
