German adjectives change their endings to match the gender and case of the noun they describe. When used with indefinite articles like "ein" or "eine", adjectives take specific endings - for example, a masculine noun like "Rock" takes the adjective ending "-er" and a feminine noun like "Jacke" takes "-e". This document provides a basic introduction to how German adjectives change their forms to agree with associated nouns.

1. Adjective Endings A very QUICK introduction 

2. What is an adjective? An adjective is a describing word. It describes the noun in asentence: the old man, cold water, an angry dog. In German adjectives are used to show the gender of the noun (whether it is a masculine, feminine, neuter or plural noun).

3. Indefinite articlesand adjective endings Indefinite article = ein, eine, einem, einer etc. Der Rock = the skirt, ein Rock = a skirt That is a black skirt. Das isteinschwarzer Rock.

4. Indefinite articlesand adjective endings cont. Die Jacke = the jacket, eineJacke = a jacket A red jacket is beautiful. Eine roteJackeistschön. Das Kleid = the dress, a dress = einKleid Here is a brown dress. HieristeinbraunesKleid.

5. Table 3: Adjective endings after the indefinite article

6. Adjective endings after the indefinite article