Just emphasis. Do not it's more like when you are angry Don't it is an abbreviation used more often when you are speaking
Why not De kinderen eten niet rijst.
Because we use geen when the translation is The children do not eat "a" rice. And that is not the case right?
It's "geen" because it's not definite. - "De kinderen eten geen chocolade reep." (The children don't eat a chocolate bar.), maar "De kinderen eten de chocolade reep niet." (The children do not eat the chocolate bar.). - "De kinderen eten geen snoepgoed." (The children don't eat candy.), maar "De kinderen eten het snoepgoed niet." (The children do not eat the candy.).
Just had the translation as 'The children do not eat ANY rice.', and had it marked as wrong for not putting the 'any' in?!
That’s the translation of: “De kinderen eten helemaal geen rijst. “ if you want to emphasize the fact that the children do not like rice. The original sentence simply says the children are not eating rice or do not like rice or even that they are eating something else.
It's not definite, hence the "geen", rather than the "niet". - "Hij leest geen andere vragen voor hij zelf een vraag stelt." (He doesn't read other questons before asking one himself.) - "Hij leest de andere vragen niet voor hij zelf een vraag stelt." (He doesn't read the other questons before asking one himself.)
Because that's the normal location of a negation. Was there something specific that made you wonder?
So am i correct in this assumption? You use niet at the end of the sentence always, and use it to generalize a negative like "no, humans don't fly". but you use geen right after a word that specifically is negative, "no the kids did not eat the rice."
That's a question about English. Was there an equivalent question about Dutch?
I've mistakenly typed rijdt instead of rijst, system has accepted it as correct sentence.
Why are you interested to know the evidence?
(Because usually claims that Duolingo doesn't work turn out to be incorrect.)
If it really didn't merely accept it as a typo, than you can report it as a bug here: < https://support.duolingo.com/hc/en-us/requests/new >.