| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | can be [art] [adv] | 198 |
|
| 2 | can be [adv] difficult | 107 |
|
| 3 | be [art] [adv] difficult | 70 |
|
| 4 | can be [art] difficult | 14 |
|
