| directly | 3 | manner |
| by destroying their leaves | 3 | manner |
| often | 2 | temporal |
| acid rain → kill → tree | 20 |
| acid rain → damage → tree | 14 |
| acid rain → affect → tree | 6 |
| acid rain → harm → tree | 5 |
| negative | neutral | positive |
| 0.909 | 0.086 | 0.004 |
| Raw frequency | 45 |
| Normalized frequency | 0.885 |
| Modifier score | 0.600 |
| Perplexity | 90.657 |