Who or Which (one)
Kiu
what
kio
what kind of
kia
where
kie
when
kiam
whose
kies
how
kiel
why
kial
how much or how many
kiom
that (one)
tiu
(Specifies the nature of the object, like that car rather than just the word that referring to the car
this (one)
či tiu
(Specifies the nature of the object, like this car rather than just this referring to the car)
that (thing)
tio
(Referring to an object without specifying what it is, like saying that when referring to a car without saying that car)
this (thing)
či tio
then, at that time
tiam
at this time
či tiam
that (conjunction)
ke