| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult believe that | 61 |
|
| 2 | be difficult believe that | 61 |
|
| 3 | [be] difficult to believe that | 61 |
|
| 4 | [is] difficult believe that | 45 |
|
| 5 | is difficult believe that | 42 |
|
| 6 | was difficult believe that | 15 |
|
| 7 | [was/were] difficult believe that | 15 |
|
