| for plant growth | 5 | purpose |
| to the war effort | 4 | transitive-object |
| in the aquarium | 3 | location |
| nitrate → be → essential | 12 |
| nitrate → be → necessary | 3 |
| nitrate → be → important | 3 |
| negative | neutral | positive |
| 0.199 | 0.547 | 0.254 |
| Raw frequency | 18 |
| Normalized frequency | 0.470 |
| Modifier score | 0.500 |
| Perplexity | 50.533 |