| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [adj] [adj] [noun pl] | 36 |
|
| 2 | it difficult [to-vb] [adj] [noun pl] | 32 |
|
| 3 | it difficult [to-vb] [adj] [noun pl] | 21 |
|
| 4 | it difficult [to-vb] [adj] [adj] | 17 |
|
| 5 | it [to-vb] [adj] [adj] [noun pl] | 12 |
|
