The exercise itself is in German; the explanation pages it links to are in Turkish.

B1.1 · n-Deklination

n-Deklination (der Junge → den Jungen) (masculine nouns taking -n/-en)

Some masculine nouns take the ending -n/-en in every case except the Nominativ (n-Deklination): der Junge → den/dem/des Jungen. This group mainly includes nouns for living beings and professions: der Student, der Kunde, der Mensch, der Nachbar, der Herr (Sg. -n, Pl. -en). You will work out the correct form yourself in the exercise. All exercise content is in German.

Recognise: match the noun with its form in the required case. Always -n / -en except in the Nominativ.

Matched: 0 / 10
Nominativ + case
Form
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B1 · N DEKLINATION
B1 N-Declension (N-Deklination) Exercises

The n-declension means that a certain group of masculine nouns takes the ending -n or -en in every case except the nominative (Akkusativ, Dativ, Genitiv). This group mostly contains words for living beings: der Junge, der Student, der Mensch, der Nachbar, der Kollege. For example, "der Student" stays unchanged as a subject; but as an object it becomes "Ich kenne den Studenten", and in the possessive "das Buch des Studenten". In the Dativ, too, we say "Ich helfe dem Jungen", not "dem Junge". Note that the ending depends on the case, not on the position of the noun in the sentence; knowing whether the verb takes the Akkusativ or the Dativ is the key to the right ending.

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Golden rule: Weak masculine nouns (der Junge, der Student) take the ending -(e)n in every case except the nominative singular: "den Studenten", "dem Jungen".

Each time you fill a gap in the interactive exercise on this page, you see an explanation of why the correct ending is -n or -en and which case (Akkusativ/Dativ/Genitiv) is involved. That way you make progress by understanding the rule instead of repeating the same mistake. It is useful for B1 learners who tend to mix up these weak nouns. If you are preparing for the Goethe-Zertifikat B1 or telc B1, working on this point, which comes up often in the writing and speaking sections, can directly raise your score; you can practise at your own pace without pressure.

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n-Deklination Meister — der Student but den Studenten — choose the right form for the gap. Free, no sign-up.
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Quick answer

What is in the "n-Deklination" exercise?

The "n-Deklination" exercise is at level B1 and has 5 steps with 50 questions in total: 10 matching items, 30 multiple-choice questions and 10 gap-fill items.

The steps in order: Match · Declension · Which noun? · Richtig/Falsch · Write.

You get instant feedback after every answer; the exercise runs in your browser, is free and needs no sign-up or installation.

Where can I study "n-Deklination"?

The explanation for this exercise is on the page N-Deklination – German Weak Noun Declension (A2/B1) (in Turkish). Read the rule there, then reinforce it with the 50 questions on this page.