| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [to-vb] that | 132 |
|
| 2 | it [is] difficult [to-vb] that | 102 |
|
| 3 | it is difficult [to-vb] that | 97 |
|
| 4 | it [be] difficult to believe that | 59 |
|
| 5 | it [was/were] difficult [to-vb] that | 30 |
|
| 6 | it was difficult [to-vb] that | 30 |
|
| 7 | it [be] difficult to imagine that | 15 |
|
| 8 | it [be] difficult to argue that | 10 |
|
| 9 | it [be] difficult to say that | 6 |
|
| 10 | it [be] difficult to see that | 6 |
|
| 11 | it 's difficult [to-vb] that | 5 |
|
| 12 | it [be] difficult to ensure that | 5 |
|
