| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [adv] difficult for | 69 |
|
| 2 | [modal v] be [adv] for [det] | 44 |
|
| 3 | be [adv] difficult for [det] | 29 |
|
| 4 | [modal v] be difficult for [det] | 11 |
|
