| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] difficult [verb] [art] | 150 |
|
| 2 | is [adv] [verb] [coord] [art] | 144 |
|
| 3 | is [adv] difficult [verb] [coord] | 32 |
|
| 4 | [adv] difficult [verb] [coord] [art] | 13 |
|
