To understand how the declension of the German adjective works, you need to pay particular attention to the adjective in question. It doesn't always appear the same way. Let's take these two example sentences:
- Ludwig ist stark. . = Ludwig is strong.
- Er hat zwei starke Arme, mit denen er Gewichte hebt. = He has two strong arms that he uses to lift weights.
As we can see, in the first sentence the adjective has no ending, it is in its base form and therefore has not been declined.
In the second sentence, on the contrary, the adjective has been declended into the same gender, number, and case as the noun it refers to. We can also notice how the two adjectives occupy different positions within the sentence: all these elements make us understand that we are dealing with two different situations.
Specifically, the declension of adjectives in German depends on the function they perform in relation to the word they refer to. We can find adjectives that perform:
- Attributive function , that is, they refer to a noun and tell us something about it;
- Predicative function , that is, they refer to a verb and complete its meaning: without the adjective, the sentence would be incomplete.
The difference between these two types of adjective is clear in syntactic position and declension, but may not be so clear in meaning.
Let's take these two example sentences to understand better:
- Mein Haus ist schön . = My house is beautiful.
- Es ist mein schönes Zuhause. = It's my beautiful home.
The meaning of the sentence is almost identical, but the adjective " schön " is not declined in the first sentence, while in the second it is declined in the nominative neuter singular, as is the word " haus " on which it is based. This is because the adjective serves a predicative function in the first sentence, forming a predicate nominal together with the auxiliary verb sein, and an attributive function in the second sentence, being placed between the article and the corresponding noun.