| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was [not/n't] [adv] [to-vb] | 302 |
|
| 2 | was [adv] difficult [to-vb] | 224 |
|
| 3 | [not/n't] [adv] difficult [to-vb] | 59 |
|
| 4 | was [not/n't] difficult [to-vb] | 49 |
|
| 5 | was [not/n't] [adv] difficult | 34 |
|
