| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for [pron] [to-vb] | 116 |
|
| 2 | [pron] be difficult for [pron] | 103 |
|
| 3 | [pron] be for [pron] [to-vb] | 88 |
|
| 4 | [pron] difficult for [pron] [to-vb] | 65 |
|
