| to the balance of nature | 5 | transitive-object |
| often | 3 | degree |
| bird → be → necessary | 11 |
| bird → be → required | 9 |
| bird → be → necessity | 3 |
| negative | neutral | positive |
| 0.196 | 0.567 | 0.237 |
| Raw frequency | 23 |
| Normalized frequency | 0.367 |
| Modifier score | 0.560 |
| Perplexity | 357.696 |