| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [modal v] be difficult for he | 6 |
|
| 2 | [pron] [vb mod] be difficult for he | 6 |
|
| 3 | [pron] be difficult for he [to-vb] | 10 |
|
| 4 | [pron] be difficult for he [verb] | 10 |
|
