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question(s) : galdera(k)  
Who? : Nor ? 
What? : Zer ? 
Which? : Zein ? 
How? : Zelan ? 
How much? : Zenbat ? 
Where? : Non ? 
To where? : Nora ? 
When? : Noiz ? 
Why?  For What? : Zergatik ?  Zertarako ? 
Because ... : Zeren eta ... 
the answer, the reply, (the response) : erantzuna 

Basque dictionary