| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult to [be] [adj] | 50 |
|
| 2 | it be difficult [prep] [be] [adj] | 50 |
|
| 3 | it be difficult to [be] [adj] | 50 |
|
| 4 | it be difficult [prep] be [adj] | 50 |
|
| 5 | it be difficult [prep] [be] [adj] | 50 |
|
| 6 | it be difficult [prep] [be] [adj] | 50 |
|
| 7 | it is difficult [prep] [be] [adj] | 33 |
|
| 8 | it be difficult [prep] [be] sure | 17 |
|
| 9 | it be difficult [prep] [be] certain | 10 |
|
| 10 | it was difficult [prep] [be] [adj] | 10 |
|
| 11 | it 's difficult [prep] [be] [adj] | 7 |
|
| 12 | it be difficult [prep] [be] precise | 5 |
|
