| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [modal v] be difficult for | 81 |
|
| 2 | that [pron] [modal v] be difficult | 65 |
|
| 3 | that [pron] be difficult for | 25 |
|
| 4 | that [pron] [modal v] be for | 10 |
|
