| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] [verb] [coord] | 1575 |
|
| 2 | [is] [adv] difficult [verb] | 1049 |
|
| 3 | [adv] difficult [verb] [coord] | 136 |
|
| 4 | [is] [adv] difficult [coord] | 51 |
|
| 5 | [is] difficult [verb] [coord] | 48 |
|
