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Questions & Answers about Das Buch ist alt.
Why is das used here instead of der or die?
In German, Buch (book) is a neuter noun, so it takes the neuter definite article das. Masculine nouns use der, and feminine nouns use die. Since Buch is neuter, we say das Buch.
Why does alt not change or have an ending in this sentence?
In the construction Das Buch ist alt, the adjective alt follows the verb ist (to be). When adjectives follow a linking verb like sein, they remain in their uninflected (base) form. Adjective endings appear when the adjective comes before the noun (for example, Das alte Buch).
Why is alt placed at the end of the sentence?
German word order is flexible, but a typical simple declarative sentence puts the verb in the second position and any complement or predicate after that. Here, ist is second, and alt (the adjective describing the book) naturally follows as the predicate adjective.
Why is Buch capitalized?
In German, all nouns are capitalized. This is a rule that applies to all nouns regardless of their position in a sentence.
Is there a difference between Das Buch ist alt and Das alte Buch?
Yes. Das Buch ist alt describes the book as old (predicate adjective after the verb). Das alte Buch uses an attributive adjective that comes directly before the noun, so alt needs the -e ending to agree with the neuter noun in the nominative case.