| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be for [noun] [to-vb] | 215 |
|
| 2 | difficult for [noun] [to-vb] | 182 |
|
| 3 | be difficult for [noun] | 91 |
|
| 4 | be difficult [noun] [to-vb] | 11 |
|
