What is taking you long to do this

tufguy

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Can I ask someone "What is taking you long to do this"?
 

Tdol

Editor, UsingEnglish.com
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Not really- it would work better with so long.
 

emsr2d2

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Using "to do this" is unnatural at the end. Usually the question "What's taking you so long?" is used when it's clear already what the activity is. Either the activity is being done while the words are spoken or the activity has already been made clear even if it's not currently ongoing.
 
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