De or het reformwinkel?

The correct Dutch article is:

de reformwinkel

How to use reformwinkel

the reformwinkelde reformwinkel
this reformwinkeldeze reformwinkel
that reformwinkeldie reformwinkel
our reformwinkelonze reformwinkel
your reformwinkeljouw reformwinkel
every reformwinkelelke reformwinkel
which reformwinkel?welke reformwinkel?
a big reformwinkel / the big reformwinkeleen grote reformwinkel, de grote reformwinkel