In German plurals seem to be confusing too, but there is a method to the madness. In German, there are rules about forming plurals, in fact, an abundance of rules. This is what makes forming plurals in German such a challenge. For now, remember that when a noun becomes plural in German, the noun marker becomes plural with it. In German, however, it's a little trickier.
Many nouns undergo a vowel modification.
There are rules for forming plurals in German, however, and many exceptions to these rules. The best way to be sure that you are forming the plural of a noun correctly is to memorize it along with the noun and the article. The following tables give you some basic rules on how to form plurals. A majority of German nouns fall into this group, including most feminine nouns. The nouns in this group never take an umlaut in the plural, but if they already have one in the singular, it is retained.