Questions & Answers about Du bist eine Frau.
Why do we use eine here instead of ein?
Because Frau (woman) is a feminine noun. In German, the word for a or an changes depending on the noun's gender. For feminine nouns in the nominative case, we use eine. If the noun were masculine or neuter, like Mann (man), we would use ein.
Why is the word Frau capitalized?
In German, all nouns (words for people, places, things, or concepts) are always capitalized no matter where they appear in a sentence. Since Frau is a noun, it gets a capital letter.
Why is the verb bist used here?
bist is the matching form of the verb sein (to be) for the pronoun du (informal you). Just like in English we say you are instead of you is, in German we must pair du with bist.
What grammatical case is eine Frau in this sentence?
It is in the nominative case. Usually, the nominative case is just for the main subject of the sentence. However, the verb sein (to be) acts like an equal sign connecting du and eine Frau. Because they are exactly the same person here, both sides of that equal sign stay in the nominative case.