Traduzca: Juan speaks as quickly as Amy.

Use “tan ... como” to compare how two people do something: “as quickly as” is “tan rápidamente como.” “Rápidamente” is an adverb, so it takes “tan,” not “tanta.” The phrase “tan ... que” means “so ... that,” which changes the meaning. Therefore, “Juan habla tan rápidamente como Amy” is correct.

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