| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [not/n't] [adv] difficult [to-vb] | 8 |
|
| 2 | was [not/n't] [adv] difficult [to-vb] | 8 |
|
| 3 | [was/were] not [adv] difficult [to-vb] | 5 |
|
