| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [not/n't] [adv] difficult [to-vb] | 36 |
|
| 2 | [is] not [adv] difficult [to-vb] | 35 |
|
| 3 | is [not/n't] [adv] difficult [to-vb] | 33 |
|
| 4 | [is] [not/n't] too difficult [to-vb] | 24 |
|
| 5 | [is] [not/n't] too difficult [to-vb] | 24 |
|
