| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [verb] [coord] | 1437 |
|
| 2 | is [adv] difficult [verb] | 830 |
|
| 3 | [adv] difficult [verb] [coord] | 136 |
|
| 4 | is [adv] difficult [coord] | 46 |
|
| 5 | is difficult [verb] [coord] | 44 |
|
