| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] to [be] [adj] | 102 |
|
| 2 | it [be] difficult to [be] | 66 |
|
| 3 | [be] difficult to [be] [adj] | 52 |
|
| 4 | it difficult to [be] [adj] | 7 |
|
