| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [am/are] not [adv] difficult [to-vb] | 7 |
|
| 2 | [am/are] not [adv] difficult [to-vb] | 7 |
|
| 3 | are not [adv] difficult [to-vb] | 6 |
|
