what is it?
German nouns belong to one of three grammatical genders — masculine, neuter, or feminine — and every article must reflect that gender. In the nominative case, which marks the subject of a sentence (the noun doing or being something), the definite article (the) takes the forms der / das / die, the indefinite article (a / an) takes ein / ein / eine, and the negative article (not a / no) takes kein / kein / keine. The nominative is also used for the complement of the verbs sein (to be), werden (to become), and bleiben (to remain) — the noun or noun phrase after these verbs describes the subject, so it stays in the nominative, not the accusative.
when to use it
Subject of a sentence. Any noun that performs the action or is described by the verb is the subject and takes the nominative article. Example: Der Hund schläft. — the dog is the one sleeping.
Complement of sein / werden / bleiben. These verbs link the subject to a description of itself. Both sides of the equation are nominative: Er ist ein Lehrer. — «Er» and «ein Lehrer» refer to the same person.
Definite article — use when the noun is specific or already known. Choose der for masculine, das for neuter, die for feminine (and all plurals).
Indefinite article — use when introducing a noun for the first time or referring to one unspecified member of a category. Choose ein for masculine and neuter, eine for feminine. There is no plural form of the indefinite article.
Negative article — use to negate a noun (equivalent to «not a» or «no»). Choose kein for masculine and neuter, keine for feminine. kein follows the same endings as ein.
formation
The three article types share the same gender distinctions in the nominative. Note that masculine and neuter are identical for ein and kein, while feminine always adds -e.
| gender | definite (the) | indefinite (a/an) | negative (no/not a) | example noun |
|---|---|---|---|---|
| masculine | der | ein | kein | der Mann (the man) |
| neuter | das | ein | kein | das Kind (the child) |
| feminine | die | eine | keine | die Frau (the woman) |
| plural (all genders) | die | — (no form) | keine | die Männer / Kinder / Frauen |
Noun gender is a property of the word itself and must be learned with each new noun. There is no reliable rule that covers every case — always note the article when you learn a new noun.
examples in context
common pitfalls
Defaulting to «der» for any unfamiliar noun. German has three genders. When you do not know a noun's gender, do not guess masculine — look it up and record the article as part of the word. Treating «der» as a safe default produces errors roughly two-thirds of the time.
Assuming English-cognate nouns are masculine. A word that looks like English is not automatically masculine. For example, «das Problem» is neuter and «die Hand» is feminine, despite their transparent English equivalents. Always verify gender independently.
Using «kein» with feminine nouns. «kein» must agree with the noun's gender. «Frau» is feminine, so the correct form is keine Frau, not *kein Frau. Apply the same logic as with «eine» vs. «ein».
Using the accusative after sein / werden / bleiben. These verbs do not take an object — they take a complement that re-identifies the subject. The complement is nominative: Er ist ein Lehrer — not *Er ist einen Lehrer. The accusative form «einen» is reserved for direct objects of action verbs.