| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [adj] [verb] [adj] | 504 |
|
| 2 | is [adv] difficult [verb] [adj] | 101 |
|
| 3 | be [adv] difficult [verb] [adj] | 74 |
|
| 4 | [be] [adv] difficult [verb] [adj] | 74 |
|
| 5 | [is] [adv] difficult [verb] [adj] | 58 |
|
