Breakdown of ¿Adónde vas tan rápido?
rápido
fast
ir
to go
tan
as / so (degree)
adónde
where (to)? (with verbs of motion)
Questions & Answers about ¿Adónde vas tan rápido?
Why is it adónde instead of just dónde here?
Adónde means "to where" and is used with verbs of motion like ir (to go) to indicate a destination. Dónde just means "where" and indicates a location. While you might hear native speakers occasionally say ¿Dónde vas? in casual speech in Spain, adónde is the grammatically correct choice when asking about a destination.
Why use tan instead of tanto in this sentence?
I thought adverbs usually end in "-mente". Why is it rápido instead of rápidamente?
While rápidamente is the standard adverb form, it is very common in everyday Spanish to use certain adjectives as adverbs without changing their form. Rápido is frequently used this way to mean "fast" or "quickly". This is just like in English, where we say "going so fast" rather than "going so fastly".
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