| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult to believe [that] [adj] | 12 |
|
| 2 | it be difficult believe that [adj] | 12 |
|
| 3 | it be difficult believe [that] [det] | 10 |
|
| 4 | it is difficult believe [that] [adj] | 8 |
|
