| highly | 31 | degree |
| heavily | 23 | degree |
| severely | 11 | degree |
| river → be → polluted | 193 |
| river → become → polluted | 70 |
| river → remain → polluted | 9 |
| river → be become → polluted | 4 |
| river → get → polluted | 3 |
| negative | neutral | positive |
| 0.772 | 0.189 | 0.038 |
| Raw frequency | 279 |
| Normalized frequency | 0.786 |
| Modifier score | 0.804 |
| Perplexity | 153.555 |