| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for [pron] [to-vb] | 116 |
|
| 2 | be for [pron] [adv] [to-vb] | 7 |
|
| 3 | difficult for [pron] [adv] [to-vb] | 6 |
|
| 4 | be difficult for [pron] [adv] | 6 |
|
