"We have apples!"
Translation:Wij hebben appels!
I want to share more details about the rule.
If nouns ending with -el, -em, -en, -er, -d, -aar, -aard or –um and if the emphasis is not in the last syllable then the nouns get –s to be plural. For instance: de le-pel > de le-pels. Because the emphasis is in le.
All of your examples have one syllable so we can say the emphasis in the last syllable. Therefore we cannot apply the rule.