Breakdown of Das Tagebuch deines Bruders ist nicht langweilig.
sein
to be
nicht
not
dein
your (informal)
der Bruder
the brother
der
who, which, that (relative pronoun; die, das)
langweilig
boring
das Tagebuch
the diary
Questions & Answers about Das Tagebuch deines Bruders ist nicht langweilig.
Why is it deines Bruders instead of dein Bruder?
This is the Genitive case, which shows possession or ownership (like saying 'of your brother' or 'your brother's'). Because Bruder is a masculine noun, the possessive word dein takes the ending -es to become deines, and the noun Bruder gets an extra -s at the end.
Can I put deines Bruders before Das Tagebuch, like in English?
Usually, no. In German, the Genitive phrase that shows who owns something almost always comes directly after the thing being owned. So the sentence structure is literally 'The diary of your brother' (Das Tagebuch deines Bruders).
Why doesn't the adjective langweilig have an ending?
Because langweilig comes after the verb ist to describe the subject. In German, adjectives only get endings (like -e, -er, or -en) when they are placed directly in front of the noun they describe, such as in ein langweiliges Buch.
How is the word Tagebuch formed?
It is a compound noun made from der Tag (the day) and das Buch (the book), joined by an -e-. When combining nouns in German, the gender of the new word is always taken from the final word. Since it is das Buch, the combined word is das Tagebuch.
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