Hemingway uses
to develop the character of the narrator in this passage.

Indirect characterization

Explanation:

I could not find the passage that is missing but since Hemingway was often using Indirect characterization for his character and narrator I will try to explain to you what is that and how can you recognize it in your passage.

He is best known for his dialogue in his artwork that is considering very realistic characters and situations. He wanted his readers to imagine how they are acting and looking by using this type of characterization. Their characteristics are shown in their dialogue but indirectly so readers can imagine and see what they were like.

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tu caminas en las clase de educacion fisica.

its translates: do you walk in in your physical education class?