| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | 's [adv] [adj] | 21725 |
|
| 2 | be [adv] difficult | 3732 |
|
| 3 | [be] [adv] difficult | 3732 |
|
| 4 | [is] [adv] difficult | 2051 |
|
