| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is difficult [to-vb] [adj] [adj] [noun pl] | 10 |
|
| 2 | is difficult [verb] [det] [adj] [noun pl] | 8 |
|
| 3 | is difficult [verb] any [adj] [noun pl] | 6 |
|
| 4 | is difficult [verb] any [adj] [noun pl] | 6 |
|
