| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] difficult [verb] [adj] | 108 |
|
| 2 | [is] [adv] [verb] [adj] [coord] | 49 |
|
| 3 | [is] [adv] difficult [verb] [coord] | 33 |
|
| 4 | [adv] difficult [verb] [adj] [coord] | 10 |
|
| 5 | [is] difficult [verb] [adj] [coord] | 5 |
|
