| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [verb] [noun] [coord] | 59 |
|
| 2 | is [adv] difficult [verb] [noun] | 58 |
|
| 3 | is [adv] difficult [verb] [coord] | 32 |
|
| 4 | [adv] difficult [verb] [noun] [coord] | 17 |
|
| 5 | is difficult [verb] [noun] [coord] | 7 |
|
