Both det and den are correct?
Yes, you don't know the gender of that is replaced by "it".
I generally go by the rule that if the object/person is before the 'It' I use 'Den' and if the object/person is after the 'It' I use 'Det' it has always worked this far.
Thanks, i shall try this...
I woud like if it was sound in the words, so I can learn how to pronounce.