If you want to master German grammar, you have to master the articles. While Unbestimmte Artikel (ein, eine) are simple in theory, they change their endings depending on the “Case” (Kasus) of the noun.
In this guide, we will look at how ein transforms across all four German cases and provide you with a master table to help you memorize the endings.
1. The Four Cases: A Quick Refresher
Before we look at the table, let’s remember what each case does:
- Nominativ: The subject (Who is doing the action?).
- Akkusativ: The direct object (What is being acted upon?).
- Dativ: The indirect object (To/for whom is it being done?).
- Genitiv: Possession (Whose is it?).
2. Indefinite Articles Declension Table
The endings of the indefinite article are almost identical to the endings of the definite articles (der, die, das).
| Case | Masculine | Feminine | Neuter | Plural |
| Nominativ | ein | eine | ein | — |
| Akkusativ | einen | eine | ein | — |
| Dativ | einem | einer | einem | — |
| Genitiv | eines (+s) | einer | eines (+s) | — |
Note: There is no plural form for the indefinite article. Just as in English you don’t say “a children,” in German you say “Kinder” (no article).
3. Key Rules to Remember
- The Masculine Change: Notice that in the Akkusativ, only the masculine form changes (ein -> einen). Feminine and Neuter stay exactly the same as in the Nominativ.
- Dativ “MEM” Rule: A helpful trick for Dativ endings is the “MEM” sequence for the genders: Masculine (m), Feminine (r), Neuter (m). (Einem, Einer, Einem).
- Genitiv S-Addition: In the Genitiv case, the masculine and neuter nouns themselves usually get an -s or -es at the end (eines Tages).
4. Real-Life Examples
Let’s see how these articles work in sentences:
- Nominativ: “Тa steht ein Mann.” (A man is standing there – Subject).
- Akkusativ: “Ich sehe einen Mann.” (I see a man – Direct Object).
- Dativ: “Ich helfe einem Mann.” (I am helping a man – Indirect Object).
- Genitiv: “Das ist die Tasche eines Mannes.” (That is a man’s bag – Possession).
5. How to Practice
The best way to learn these is not by staring at the table, but by using them with prepositions. Certain prepositions “force” a specific case:
- Akkusativ prepositions: durch, für, gegen, ohne, um.
- Dativ prepositions: aus, bei, mit, nach, von, zu.
Final Thoughts
Declension can feel like a lot of math at first, but it follows a very logical pattern. Once you memorize the masculine change in Akkusativ and the “MEM” rule for Dativ, you are already 80% there!
Next Step: Now that you’ve mastered the positive “ein,” it’s time to learn how to say “no” or “none.” Check out our guide on Ein vs. Kein in German – What’s the Difference? to master negation!