General usage:
* The librarian classified the books by genre.
* Scientists classify animals based on their physical characteristics.
* The doctor classified her illness as a mild case of the flu.
With different tenses:
* The teacher will classify the students into different reading groups.
* The researchers have classified the new species of plant.
* The detective is classifying the evidence to determine the suspect.
With different meanings:
* The government classified the documents as top secret. (meaning: to designate as secret)
* The restaurant classifies as fine dining. (meaning: to categorize)
* She classified her feelings as a mix of sadness and anger. (meaning: to analyze and identify)
In a formal context:
* The study classified the participants into two groups based on their age.
* The research paper classified the findings into three categories.
These are just a few examples. The best way to use "classify" depends on the specific context and the intended meaning.