qui�n?
(singular, to ask about one person) who?
qui�nes?
who? plural (used when you assume the answer is more than one person)
qu�?
what?
cu�l?
which?
cu�les?
which ones?, what? (in front of a plural noun)
c�mo?
how?
d�nde?
where?
cu�ndo?
when?
cu�nto?
how much? (used in front of a singular, masculine noun)
cu�nta?
how much (used in front of a singular, feminine noun)
cu�ntos?
how many? (used in front of a plural, masculine noun)
cu�ntas?
how many (used in front of a plural, feminine noun)
por qu�?
why? (because of what?)
para qu�?
why? what for? (for what purpose)?