"When does the man cook food?"
Translation:Hvornår laver manden mad?
No, because "koger" actually translates to "boiling." For instance: "The water boils" = "Vandet koger". The right word to use in the Duolingo sentence would be "laver" (makes) which is more common but you could also use "tilbereder" which translates to "cooks" in English (but is less commonly used). Hope that helps :-)
because you want to be able to say when does the man cook food. to say this, you need "hvornår" (when). then the next part, "does he cook food" which translates to "laver manden mad". if you said "manden laver mad", it would be "the man does cook food". You need to use inversion to flip "the man does cook food" to "does the man cook food. " im not sure if that made sense, but I hope it helped.