| very | 50 | degree |
| often | 21 | degree |
| extremely | 18 | degree |
| learning → be → difficult | 493 |
| learning → be → difficult process | 17 |
| learning → be → difficult thing | 7 |
| learning → prove → difficult | 5 |
| learning → be difficult to → achieve | 4 |
| learning → remain → difficult | 3 |
| negative | neutral | positive |
| 0.516 | 0.331 | 0.152 |
| Raw frequency | 529 |
| Normalized frequency | 0.755 |
| Modifier score | 0.604 |
| Perplexity | 32.894 |