| regularly | 12 | degree |
| once per year | 4 | temporal |
| during the tune-up | 4 | temporal |
| furnace → be → cleaned | 71 |
| furnace → need → cleaning | 7 |
| furnace → include → cleaning | 4 |
| negative | neutral | positive |
| 0.197 | 0.632 | 0.171 |
| Raw frequency | 82 |
| Normalized frequency | 0.715 |
| Modifier score | 0.800 |
| Perplexity | 212.895 |