| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [adj] [noun pl] | 853 |
|
| 2 | difficult [verb] [adj] [noun pl] | 141 |
|
| 3 | is difficult [verb] [adj] | 77 |
|
| 4 | is difficult [verb] [noun pl] | 44 |
|
