| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been difficult for [art] [noun] | 9 |
|
| 2 | been difficult for [art] [noun] | 9 |
|
| 3 | been difficult for the [noun] | 7 |
|
| 4 | been difficult for the [noun] | 7 |
|
| 5 | been difficult for [noun] [verb] | 5 |
|
| 6 | been difficult for [noun] [to-vb] | 5 |
|
