Most masculine nouns in plural?
Add -e and many put an umlaut on the main vowel. (Der Stuhl, die Stühle)
Neuter nouns in plural?
Add -er and put an umlaut on main vowel (das Schloss, die Schlösser)
However most masculine and neuter nouns ending in -el, -en, -er, -Chen and -lein
STAY THE SAME der Onkel, die Onkel
Neuter nouns ending in -um change this to…
-en - das Zentrum, die Zentren
In the dative plural, what happens to nouns in the plural form?
Add an extra -n or -en to the plural form (unless already ending in -n or -s)
How to form the plural of most feminine nouns?
Add -n, -en, or -nen