| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for [pron] [verb] | 117 |
|
| 2 | it be difficult for [pron] | 101 |
|
| 3 | it be for [pron] [verb] | 86 |
|
| 4 | it difficult for [pron] [verb] | 66 |
|
