| heavily | 7 | degree |
| quite | 3 | degree |
| over the last ten years | 2 | temporal |
| river → be → silted | 12 |
| river → become → silted | 5 |
| river → be full of → silt | 3 |
| river → fill with → silt | 3 |
| negative | neutral | positive |
| 0.447 | 0.457 | 0.095 |
| Raw frequency | 23 |
| Normalized frequency | 0.353 |
| Modifier score | 0.500 |
| Perplexity | 169.521 |