| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] [prep] [pron] [verb] [prep] | 115 |
|
| 2 | [be] difficult [prep] [pron] [verb] [prep] | 16 |
|
| 3 | [is] difficult [prep] [pron] [verb] [prep] | 11 |
|
