| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] [adj] [verb] [subord] | 294 |
|
| 2 | [is] [adv] [adj] [verb] [subord] | 251 |
|
| 3 | [be] [adv] difficult [verb] [subord] | 126 |
|
| 4 | [is] [adv] difficult [verb] [conj] | 126 |
|
| 5 | [is] [adv] difficult [verb] [subord] | 60 |
|
