| much | 19 | degree |
| in some ways | 12 | manner |
| in recent years | 5 | temporal |
| river → be → cleaner | 70 |
| river → become → cleaner | 19 |
| river → get → cleaner | 11 |
| negative | neutral | positive |
| 0.074 | 0.264 | 0.662 |
| Raw frequency | 100 |
| Normalized frequency | 0.608 |
| Modifier score | 0.700 |
| Perplexity | 234.006 |