Breakdown of Ein schmutziger Ofen ist kein praktischer Ofen.
sein
to be
ein
a, an (eine)
kein
no, not any
der Ofen
the oven
schmutzig
dirty
praktisch
practical
Questions & Answers about Ein schmutziger Ofen ist kein praktischer Ofen.
Why do both schmutziger and praktischer end in -er?
They are both describing the masculine noun Ofen in the nominative case. Because the articles ein and kein don't have special endings here to show the masculine gender, the adjective has to do the heavy lifting by adding -er (which sounds like the end of the masculine "the" word, der).
Why is kein praktischer Ofen in the nominative case instead of the accusative?
The verb sein (used here as ist) is a linking verb. Think of it like an equals sign connecting the subject to its description. Because it is just renaming or describing the subject, both sides of the sentence stay in the nominative case.
Why do we use kein here instead of nicht for "not"?
When you want to negate a noun that would normally use an indefinite article (a/an), German uses kein. Instead of saying "not a practical oven" (nicht ein...), German speakers smoothly combine them into kein praktischer Ofen (literally "no practical oven").
What if the noun wasn't masculine? Would the adjectives still end in -er?
No, the adjective endings would change to match the new gender! If the sentence used the feminine noun Küche (kitchen), it would be eine schmutzige Küche ist keine praktische Küche. For the neuter noun Haus (house), it would be ein schmutziges Haus ist kein praktisches Haus.
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