| very | 10 | degree |
| for the students of the history | 8 | transitive-object |
| often | 7 | degree |
| history → be → difficult | 30 |
| history → be → hard | 23 |
| history → be not → easy | 3 |
| negative | neutral | positive |
| 0.481 | 0.388 | 0.131 |
| Raw frequency | 56 |
| Normalized frequency | 0.555 |
| Modifier score | 0.640 |
| Perplexity | 71.197 |