| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] is [adv] difficult [to-vb] | 18 |
|
| 2 | [noun pl] is [adv] difficult [to-vb] | 18 |
|
| 3 | [noun pl] is more difficult [to-vb] | 7 |
|
| 4 | [noun pl] is more difficult [to-vb] | 7 |
|
