| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be difficult for [pron] [to-vb] | 8 |
|
| 2 | may be difficult for [pers pn] [verb] | 8 |
|
| 3 | may be difficult for [pron] [verb] | 8 |
|
| 4 | may be difficult for [pron] [verb] | 8 |
|
