| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be difficult for | 109 |
|
| 2 | [det] [vb mod] be difficult | 71 |
|
| 3 | [det] [vb mod] be for | 55 |
|
| 4 | [det] be difficult for | 6 |
|
