Traduzca: Juan speaks as quickly as Amy.

For a comparison meaning “as quickly as,” Spanish uses tan before an adverb and como to introduce the comparison: tan rápidamente como. Therefore, “Juan speaks as quickly as Amy” is “Juan habla tan rápidamente como Amy.” Tanta is used with feminine nouns, not with the adverb rápidamente, and que does not express this equal comparison.

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