Estaba sorprendido de lo caro que eran los zapatos.

English Translation

I was surprised at how expensive the shoes were.

Shouldn’t it be “lo caros”?

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I think that caro is being used as a noun in this sentence. The closest English sentence would be “I was surprised at the expensiveness of the shoes.”

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Well, my grammar has this example: “Al menos tiene el coraje de señalar lo feas que son las camisas de los turistas.”

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both lo caro and lo caros work here :slight_smile:

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