The subject of a sentence is always in the nominative.
Der Mann kommt aus Frankreich.
Sometimes there is also a second nominative in the sentence, e.g. with the verb sein:
Der Mann ist ein Feinschmecker.
The second nominative gives more detail about the subject. It can only be used with a few verbs, e.g., werden and bleiben as well as sein. These verbs link the subject to a noun in the nominative.
Nominative articles
Here is another overview of some nominative articles that you have already studied.
Nominative | |
Masculine | der |
ein | |
kein | |
mein | |
Feminine | die |
eine | |
keine | |
meine | |
Neuter | das |
ein | |
kein | |
mein | |
Plural | die |
- | |
keine | |
meine |