| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [be] difficult [verb] [conj] | 258 |
|
| 2 | [pron] [be] often [verb] [conj] | 232 |
|
| 3 | [pron] [be] often difficult [verb] | 78 |
|
| 4 | [be] often difficult [verb] [conj] | 14 |
|
