if in the word are 2 the same vowels (fe. aa) , and after these vowels are 2 consonants (like in the word PAARD) then in the plural are 2 vowels (PAARDEN). but if in the word are 2 the same vowels and after these vowels is only the one consonant (like in the word SCHAAP), then in the plural is only the one vowel (SCHAPEN)
I have a rather basic problem. It is not the lessons. It is how to maneuver through this site to get back to the lesson, after using "discussion"- and I still don't know how to find the accent keys on the keyboard for "oke", either. Nothing worked for me. Does a person go back the next day to look?