Breakdown of Ist der Kaffee vom Chef?
sein
to be
der Kaffee
the coffee
der Chef
the boss (male)
vom
from the (von + dem) / of the (belonging to) / by the (agent in a passive clause)
Questions & Answers about Ist der Kaffee vom Chef?
Where does the word vom come from?
It is a combination of the preposition von (from) and the article dem (the). The preposition von always forces the following noun into the dative case. Because Chef is a masculine noun, its word for the changes to dem in the dative. They combine to make vom.
Does Chef mean a cook in a restaurant?
No, this is a classic false friend! In German, Chef means your boss or supervisor. If you are looking for the person cooking your food, you need the word Koch.
Why is it der Kaffee here and not den Kaffee?
Because the coffee is the main subject of the sentence. The verb ist (is) just links the subject to a description. When a masculine noun is the subject, it stays in the basic nominative case (der). If someone were buying or drinking the coffee, it would be the receiving object and change to the accusative case (den).
Is it wrong to write von dem Chef as two separate words?
It is grammatically correct, but contractions like vom are highly preferred in everyday German. You usually only separate them into von dem if you are pointing out a specific boss, as if saying it is from THAT boss.