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I have the feeling that this is correct:

mit guten Ergebnissen

and this is not correct:

mit guten Ergebnisse

But I don't really know a rule here for other nouns, e.g. "mit guten Bäumen"? or "mit guten Monitoren"?.

Do you always add a "-n" to all plural nouns that are in the dativ case?

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2 Answers 2

up vote 11 down vote accepted

The rule is: if you use dative plural you have to append an -n to the nominative plural form:

  • die Monate / den Monaten
  • die Eier / den Eiern
  • die Bäume / den Bäumen

There are two exceptions to this rule:

  1. If the nominative plural already ends with an -n, it remains the same:

    • die Eltern / den Eltern
    • die Hunnen / den Hunnen
    • die Mädchen / den Mädchen
  2. If the plural form ends with an -s:

    • die Fotos / den Fotos
    • die Ufos / den Ufos
    • PCs / den PCs
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The rule is very simple: the dative plural of nouns almost always ends in "-n".
There are very few exceptions like:

ich gebe es den Opas, den Omas.

Also, a few words of English origin have their dative plural in "-s" :

Aus den Parks, aus den Wracks, auf den Decks.

But these exceptions are statistically negligible. The robust rule is:

Use "-n" for nouns in the dative plural.

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