German grammar
German Nominative Case
The nominative case marks the subject of a German sentence.
Examples
Der Mann wartet.
The man is waiting.
der Mann is the subject.
Die Frau antwortet.
The woman answers.
die Frau is the subject.
Das Kind schläft.
The child is sleeping.
das Kind is the subject.
Common mistake
The subject form is not always the form you need after a verb.