The accusative case

Ich kaufe einen Apfel.I'm buying an apple.

The accusative is the case for the direct object — the person or thing that completes the verb, as in "see a dog," "buy an apple," or "have a brother." It's German's second case after the nominative (the subject), and only the masculine article changes: der/ein → den/einen.

Quick shortcut: only the masculine singular article changes — der → den, ein → einen. Feminine, neuter, and plural articles stay exactly the same.

What the direct object is

The direct object is the person or thing that the verb is about in sentences like "read a book," "see a dog," "buy an apple," or "have a pen":

• Ich lese das Buch. (I'm reading the book.) — das Buch is what's being read.
• Er kauft einen Apfel. (He's buying an apple.) — einen Apfel is what's being bought.
• Ich habe einen Bruder. (I have a brother.) — einen Bruder is accusative here too, even though no action is really happening to him.

It helps to compare this to the subject, which is doing the action: in these sentences, ich and er are the subjects (nominative), while das Buch, einen Apfel, and einen Bruder are the direct objects (accusative). English mostly relies on word order for this — "I read the book," not "the book I" — though English pronouns still show a trace of it (he → him, she → her). German goes further and marks the object directly on the article, at least for one gender.

Only the masculine article changes

This is the one fact that matters most: in the accusative, only masculine singular articles change. Feminine, neuter, and plural articles look exactly the same as they do in the nominative.

• Der Hund ist groß. (subject, nominative) → Ich sehe den Hund. (direct object, accusative) — masculine changes
• Die Katze schläft. → Ich sehe die Katze. — feminine stays the same
• Das Kind spielt. → Ich sehe das Kind. — neuter stays the same
• Die Kinder spielen. → Ich sehe die Kinder. — plural stays the same

In the simple article forms shown here, masculine singular is the only place where the nominative and accusative articles actually look different — a small handful of masculine nouns also add their own ending (der Junge → den Jungen), but that's a detail for later, not something you need for most nouns.

Recognizing the direct object

A useful question to ask is "whom or what?" right after the verb — for many verbs, whatever answers that question is the direct object:

• Die Frau liest den Roman. (The woman is reading the novel.) — reading what? den Roman.
• Wir besuchen die Oma. (We're visiting grandma.) — visiting whom? die Oma.

This question isn't perfectly reliable, though: a few common German verbs (like helfen — to help, or danken — to thank) also answer "whom?" but actually take a different case, the dative — Ich helfe dem Mann, not den Mann. Those verbs need to be learned individually as exceptions; for most everyday verbs, the "whom or what?" question works well. Not every verb takes a direct object at all — Ich schlafe (I'm sleeping) has only a subject, nothing else.

Common mistakes

• ❌ Ich sehe der Hund. → ✅ Ich sehe den Hund. (the masculine article must switch to the accusative form for a direct object)
• ❌ Ich sehe einen Buch. → ✅ Ich sehe ein Buch. (neuter ein stays ein in the accusative — only masculine ein becomes einen)
• ❌ Ich sehe eine Katze "corrected" to den Katze → ✅ Ich sehe die Katze stays unchanged — feminine articles never switch in the accusative
• ❌ Assuming every sentence needs a direct object, e.g. forcing one into Ich schlafe das Bett → ✅ Ich schlafe. (some verbs simply don't take a direct object)

Quick check

Which form is correct?

1. Ich lese ___ Buch. (das / den) — book, neuter
2. Er kauft ___ Apfel. (ein / einen) — apple, masculine
3. Wir sehen ___ Frau. (die / den) — woman, feminine
4. Sie besuchen ___ Kinder. (die / den) — children, plural

Key takeaways

• The accusative case most often marks the direct object — the person or thing that completes the verb.
• Only the masculine singular article changes in the accusative: der → den, ein → einen.
• Feminine, neuter, and plural articles are identical in the nominative and accusative — there's nothing new to learn for them here.
• Asking "whom or what?" right after the verb usually finds the direct object, but a few verbs (like helfen, danken) take a different case despite answering that question — and not every verb has a direct object at all.