| very | 5 | degree |
| for children | 3 | transitive-object |
| often | 3 | degree |
| skill → be → difficult | 23 |
| skill → be → hard | 6 |
| skill → be → challenging | 4 |
| skill → be → tough | 3 |
| negative | neutral | positive |
| 0.278 | 0.454 | 0.268 |
| Raw frequency | 36 |
| Normalized frequency | 0.429 |
| Modifier score | 0.550 |
| Perplexity | 138.242 |