Breakdown of Das Aquarium hat die perfekte Länge.
haben
to have
perfekt
perfect / perfectly
der
who, which, that (relative pronoun; die, das)
die Länge
the length
das Aquarium
the aquarium
Questions & Answers about Das Aquarium hat die perfekte Länge.
How is Länge derived from its root adjective?
Länge (length) is an abstract noun derived from the adjective lang (long). Following the pattern for this type of noun, you add the suffix -e and apply an umlaut to the root vowel, changing the a to an ä. All nouns formed this way are feminine, which is why it takes the article die.
Are there other common nouns that follow this exact a to ä plus -e pattern?
Yes! This is a very regular pattern for creating abstract nouns. Other common examples you should know at this level include stark (strong) becoming die Stärke (strength), warm (warm) becoming die Wärme (warmth), and nah (near) becoming die Nähe (closeness).
Why does the adjective perfekte only have an -e ending here even though it is the direct object?
Das Aquarium is the subject, so die perfekte Länge is the accusative direct object. Because it follows the definite article die, it uses weak adjective declension. For feminine singular nouns in the accusative case, the weak ending is simply -e.
Aquarium is a neuter word ending in -um. How do you form its plural?
The plural is die Aquarien. Nouns of Latin origin that end in -um almost always change that suffix to -en in the plural. This is a highly consistent pattern you will also see in words like das Museum (die Museen) and das Zentrum (die Zentren).
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