| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] difficult [to-vb] | 308 |
|
| 2 | be [adv] [adv] [to-vb] | 37 |
|
| 3 | [adv] difficult [adv] [to-vb] | 27 |
|
| 4 | be [adv] difficult [adv] | 13 |
|
| 5 | be difficult [adv] [to-vb] | 8 |
|
