| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult to [be] [adj] [prep] | 44 |
|
| 2 | difficult to be [adj] [prep] | 44 |
|
| 3 | difficult to be [adj] [prep] | 44 |
|
| 4 | difficult to [be] [adj] about | 15 |
|
| 5 | difficult to [be] [adj] of | 13 |
|
| 6 | difficult to [be] certain [prep] | 9 |
|
| 7 | difficult to [be] sure [prep] | 7 |
|
| 8 | difficult to [be] [adj] in | 6 |
|
| 9 | difficult to [be] precise [prep] | 5 |
|
