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Questions & Answers about Der Boden ist glatt.
Why is der used before Boden?
Der is the definite article for masculine nouns in the nominative singular. Boden is a masculine noun in German, and since it’s the subject of the sentence, it takes der.
What case is Der Boden in, and why?
It’s in the nominative case because Der Boden is the grammatical subject. In German, the subject of a sentence always appears in the nominative.
Why doesn’t glatt take an ending here?
After a form of sein (to be), adjectives are used predicatively and remain uninflected. Predicative adjectives never take endings, so it’s simply glatt, not glatte or glatter.
How would it look if I wanted to use glatt attributively (before the noun)?
When an adjective directly modifies a noun (attributive use), it must be inflected. With the definite article for a masculine nominative noun you get: der glatte Boden.
What’s the difference between glatt and rutschig?