| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult [to-vb] [coord] the [noun] | 7 |
|
| 2 | [be] difficult [to-vb] and the [noun] | 6 |
|
| 3 | [be] difficult [to-vb] [coord] the [noun sg] | 5 |
|
