The relative pronoun (who, which, that) looks like the definite article. Two steps: gender and number come from the noun it replaces; the case comes from its role inside the relative clause. Verb at the end, commas around. Unlike English, it can never be left out.
| m | f | n | pl | |
|---|---|---|---|---|
| Nom. | der | die | das | die |
| Akk. | den | die | das | die |
| Dat. | dem | der | dem | denen |
| Gen. | dessen | deren | dessen | deren |
Das ist die Frau, die ich gestern getroffen habe.
That's the woman I met yesterday.
Die Kinder, denen ich helfe, sind sehr nett.
The children I help are very nice.
Mein Freund, dessen Schwester in Luzern wohnt, kommt morgen.
My friend, whose sister lives in Lucerne, is coming tomorrow.
Das ist alles, was ich weiß.
That's all I know.
Translate the words from your reading, review them as flashcards and practise with gap-fill sentences.
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