| in heavy duty work | 5 | other |
| tractor → be → necessary | 8 |
| tractor → be → required | 5 |
| tractor → be → necessity | 4 |
| tractor → be → need | 3 |
| negative | neutral | positive |
| 0.128 | 0.718 | 0.154 |
| Raw frequency | 20 |
| Normalized frequency | 0.529 |
| Modifier score | 0.450 |
| Perplexity | 360.118 |