| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [pron] is [verb] [prep] | 327 |
|
| 2 | difficult [pron] [be] [verb] [prep] | 14 |
|
| 3 | difficult [pron] be [verb] [prep] | 14 |
|
| 4 | difficult [pron] [is] [verb] [prep] | 12 |
|
